Made quick and dirty using chatgpt

measure_click_gtk.py

import gi
gi.require_version("Gtk", "4.0")
from gi.repository import Gtk, GLib, Gdk
import time

class MouseTimer(Gtk.Application):
    def __init__(self):
        super().__init__()
        self.press_time = None

    def do_activate(self):
        window = Gtk.ApplicationWindow(application=self)
        window.set_title("Mouse Hold Timer")
        window.set_default_size(300, 100)

        label = Gtk.Label(label="Click and hold the mouse")
        window.set_child(label)
        self.label = label

        # GestureClick to capture press/release
        gesture = Gtk.GestureClick()
        gesture.set_button(Gdk.BUTTON_PRIMARY)
        gesture.connect("pressed", self.on_pressed)
        gesture.connect("released", self.on_released)

        # Attach gesture to the window or label
        window.add_controller(gesture)

        window.present()

    def on_pressed(self, gesture, n_press, x, y):
        self.press_time = time.perf_counter()

    def on_released(self, gesture, n_press, x, y):
        if self.press_time:
            elapsed = time.perf_counter() - self.press_time
            self.label.set_label(f"Mouse held for {elapsed:.3f} seconds")
            print(f"Mouse held for {elapsed:.3f} seconds")
            self.press_time = None

app = MouseTimer()
app.run()

measure_click_qt.py

import sys
import time
from PyQt5.QtWidgets import QApplication, QLabel, QWidget, QVBoxLayout
from PyQt5.QtCore import Qt

class MouseTimer(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("Mouse Hold Timer")
        self.setGeometry(100, 100, 300, 100)

        self.label = QLabel("Click and hold the mouse", self)
        self.label.setAlignment(Qt.AlignCenter)

        layout = QVBoxLayout()
        layout.addWidget(self.label)
        self.setLayout(layout)

        self.press_time = None

    def mousePressEvent(self, event):
        if event.button() == Qt.LeftButton:
            self.press_time = time.perf_counter()

    def mouseReleaseEvent(self, event):
        if event.button() == Qt.LeftButton and self.press_time:
            elapsed = time.perf_counter() - self.press_time
            self.label.setText(f"Mouse held for {elapsed:.3f} seconds")
            print(f"Mouse held for {elapsed:.3f} seconds")
            self.press_time = None

if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = MouseTimer()
    window.show()
    sys.exit(app.exec_())