diff --git a/src/qt/bitcoin.cpp b/src/qt/bitcoin.cpp
index debab9e2a2..b251da5d02 100644
--- a/src/qt/bitcoin.cpp
+++ b/src/qt/bitcoin.cpp
@@ -44,6 +44,7 @@
 #endif // ENABLE_WALLET
 
 #include <boost/signals2/connection.hpp>
+#include <chrono>
 #include <memory>
 
 #include <QApplication>
@@ -398,10 +399,10 @@ void BitcoinApplication::initializeResult(bool success, interfaces::BlockAndHead
             connect(paymentServer, &PaymentServer::message, [this](const QString& title, const QString& message, unsigned int style) {
                 window->message(title, message, style);
             });
-            QTimer::singleShot(100, paymentServer, &PaymentServer::uiReady);
+            QTimer::singleShot(100ms, paymentServer, &PaymentServer::uiReady);
         }
 #endif
-        pollShutdownTimer->start(200);
+        pollShutdownTimer->start(SHUTDOWN_POLLING_DELAY);
     } else {
         Q_EMIT splashFinished(); // Make sure splash screen doesn't stick around during shutdown
         quit(); // Exit first main loop invocation
diff --git a/src/qt/clientmodel.cpp b/src/qt/clientmodel.cpp
index d604e3ac79..5dd3e8198a 100644
--- a/src/qt/clientmodel.cpp
+++ b/src/qt/clientmodel.cpp
@@ -21,6 +21,7 @@
 #include <netbase.h>
 #include <util/system.h>
 #include <util/threadnames.h>
+#include <util/time.h>
 #include <validation.h>
 
 #include <stdint.h>
@@ -323,7 +324,7 @@ static void BlockTipChanged(ClientModel* clientmodel, SynchronizationState sync_
     const bool throttle = (sync_state != SynchronizationState::POST_INIT && !fHeader) || sync_state == SynchronizationState::INIT_REINDEX;
     const int64_t now = throttle ? GetTimeMillis() : 0;
     int64_t& nLastUpdateNotification = fHeader ? nLastHeaderTipUpdateNotification : nLastBlockTipUpdateNotification;
-    if (throttle && now < nLastUpdateNotification + MODEL_UPDATE_DELAY) {
+    if (throttle && now < nLastUpdateNotification + count_milliseconds(MODEL_UPDATE_DELAY)) {
         return;
     }
 
diff --git a/src/qt/guiconstants.h b/src/qt/guiconstants.h
index 87f47b023f..4dd734b4d4 100644
--- a/src/qt/guiconstants.h
+++ b/src/qt/guiconstants.h
@@ -6,10 +6,16 @@
 #ifndef BITCOIN_QT_GUICONSTANTS_H
 #define BITCOIN_QT_GUICONSTANTS_H
 
+#include <chrono>
 #include <cstdint>
 
-/* Milliseconds between model updates */
-static const int MODEL_UPDATE_DELAY = 250;
+using namespace std::chrono_literals;
+
+/* A delay between model updates */
+static constexpr auto MODEL_UPDATE_DELAY{250ms};
+
+/* A delay between shutdown pollings */
+static constexpr auto SHUTDOWN_POLLING_DELAY{200ms};
 
 /* AskPassphraseDialog -- Maximum passphrase length */
 static const int MAX_PASSPHRASE_SIZE = 1024;
diff --git a/src/qt/optionsdialog.cpp b/src/qt/optionsdialog.cpp
index 08da36cff8..1b537a9411 100644
--- a/src/qt/optionsdialog.cpp
+++ b/src/qt/optionsdialog.cpp
@@ -24,6 +24,8 @@
 #include <util/underlying.h>
 
 #include <QButtonGroup>
+#include <chrono>
+
 #include <QDataWidgetMapper>
 #include <QDir>
 #include <QIntValidator>
@@ -457,7 +459,7 @@ void OptionsDialog::showRestartWarning(bool fPersistent)
         ui->statusLabel->setText(tr("This change would require a client restart."));
         // clear non-persistent status label after 10 seconds
         // Todo: should perhaps be a class attribute, if we extend the use of statusLabel
-        QTimer::singleShot(10000, this, &OptionsDialog::clearStatusLabel);
+        QTimer::singleShot(10s, this, &OptionsDialog::clearStatusLabel);
     }
 }
 
diff --git a/src/qt/sendcoinsdialog.cpp b/src/qt/sendcoinsdialog.cpp
index 1319d1d836..79526f9381 100644
--- a/src/qt/sendcoinsdialog.cpp
+++ b/src/qt/sendcoinsdialog.cpp
@@ -24,10 +24,11 @@
 #include <node/ui_interface.h>
 #include <policy/fees.h>
 #include <txmempool.h>
+#include <validation.h>
 #include <wallet/coincontrol.h>
 #include <wallet/fees.h>
 #include <wallet/wallet.h>
-#include <validation.h>
+#include <chrono>
 
 #include <array>
 #include <fstream>
@@ -1080,7 +1081,7 @@ SendConfirmationDialog::SendConfirmationDialog(const QString& title, const QStri
 int SendConfirmationDialog::exec()
 {
     updateYesButton();
-    countDownTimer.start(1000);
+    countDownTimer.start(1s);
     return QMessageBox::exec();
 }
 
diff --git a/src/qt/test/addressbooktests.cpp b/src/qt/test/addressbooktests.cpp
index 5eb00a1c32..3e0be6da11 100644
--- a/src/qt/test/addressbooktests.cpp
+++ b/src/qt/test/addressbooktests.cpp
@@ -19,6 +19,8 @@
 #include <wallet/wallet.h>
 #include <walletinitinterface.h>
 
+#include <chrono>
+
 #include <QApplication>
 #include <QTimer>
 #include <QMessageBox>
@@ -39,7 +41,7 @@ void EditAddressAndSubmit(
     dialog->findChild<QLineEdit*>("labelEdit")->setText(label);
     dialog->findChild<QValidatedLineEdit*>("addressEdit")->setText(address);
 
-    ConfirmMessage(&warning_text, 5);
+    ConfirmMessage(&warning_text, 5ms);
     dialog->accept();
     QCOMPARE(warning_text, expected_msg);
 }
diff --git a/src/qt/test/util.cpp b/src/qt/test/util.cpp
index 987d921f03..635dbcd1c5 100644
--- a/src/qt/test/util.cpp
+++ b/src/qt/test/util.cpp
@@ -2,6 +2,8 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+#include <chrono>
+
 #include <QApplication>
 #include <QMessageBox>
 #include <QPushButton>
@@ -9,7 +11,7 @@
 #include <QTimer>
 #include <QWidget>
 
-void ConfirmMessage(QString* text, int msec)
+void ConfirmMessage(QString* text, std::chrono::milliseconds msec)
 {
     QTimer::singleShot(msec, [text]() {
         for (QWidget* widget : QApplication::topLevelWidgets()) {
diff --git a/src/qt/test/util.h b/src/qt/test/util.h
index df5931a032..f50a6b6c61 100644
--- a/src/qt/test/util.h
+++ b/src/qt/test/util.h
@@ -5,7 +5,11 @@
 #ifndef BITCOIN_QT_TEST_UTIL_H
 #define BITCOIN_QT_TEST_UTIL_H
 
-#include <QString>
+#include <chrono>
+
+QT_BEGIN_NAMESPACE
+class QString;
+QT_END_NAMESPACE
 
 /**
  * Press "Ok" button in message box dialog.
@@ -13,6 +17,6 @@
  * @param text - Optionally store dialog text.
  * @param msec - Number of milliseconds to pause before triggering the callback.
  */
-void ConfirmMessage(QString* text = nullptr, int msec = 0);
+void ConfirmMessage(QString* text, std::chrono::milliseconds msec);
 
 #endif // BITCOIN_QT_TEST_UTIL_H
diff --git a/src/qt/test/wallettests.cpp b/src/qt/test/wallettests.cpp
index 3a8b297037..fe16db6c4e 100644
--- a/src/qt/test/wallettests.cpp
+++ b/src/qt/test/wallettests.cpp
@@ -25,6 +25,7 @@
 #include <qt/recentrequeststablemodel.h>
 #include <qt/receiverequestdialog.h>
 
+#include <chrono>
 #include <memory>
 
 #include <QAbstractButton>
diff --git a/src/qt/transactionview.cpp b/src/qt/transactionview.cpp
index 55760147c5..fdc2e5cb85 100644
--- a/src/qt/transactionview.cpp
+++ b/src/qt/transactionview.cpp
@@ -23,6 +23,7 @@
 #include <optional>
 
 #include <QCalendarWidget>
+#include <chrono>
 #include <QComboBox>
 #include <QDateTimeEdit>
 #include <QDesktopServices>
@@ -114,8 +115,8 @@ TransactionView::TransactionView(QWidget* parent) :
     amountWidget->setObjectName("amountWidget");
     hlayout->addWidget(amountWidget);
 
-    // Delay before filtering transactions in ms
-    static const int input_filter_delay = 200;
+    // Delay before filtering transactions
+    static constexpr auto input_filter_delay{200ms};
 
     QTimer* amount_typing_delay = new QTimer(this);
     amount_typing_delay->setSingleShot(true);
diff --git a/src/qt/walletcontroller.cpp b/src/qt/walletcontroller.cpp
index 2133999b9b..b39f630ccb 100644
--- a/src/qt/walletcontroller.cpp
+++ b/src/qt/walletcontroller.cpp
@@ -21,6 +21,7 @@
 #include <wallet/wallet.h>
 
 #include <algorithm>
+#include <chrono>
 
 #include <QApplication>
 #include <QMessageBox>
@@ -271,12 +272,12 @@ void CreateWalletActivity::createWallet()
         flags |= WALLET_FLAG_DESCRIPTORS;
     }
 
-    QTimer::singleShot(500, worker(), [this, name, flags] {
+    QTimer::singleShot(500ms, worker(), [this, name, flags] {
         std::unique_ptr<interfaces::Wallet> wallet = node().walletLoader().createWallet(name, m_passphrase, flags, m_error_message, m_warning_message);
 
         if (wallet) m_wallet_model = m_wallet_controller->getOrCreateWallet(std::move(wallet));
 
-        QTimer::singleShot(500, this, &CreateWalletActivity::finish);
+        QTimer::singleShot(500ms, this, &CreateWalletActivity::finish);
     });
 }