Here is a AutoHotkey script that lets you choose an amount of clicks and the interval between them to click that many times automatically. I used this to level up my skills in video game Valheim.
You have to download AutoHotkey and install it first. After that, download AutoClicker and run it.
Press the + on your keypad. A window will pop up and ask you how many times you want to click. Just pressing enter will default to 100. After that, a second one will pop up and ask you the interval between each click in miliseconds. Default is 1000, which is a second.
Clicking will start now and a text bubble will show you how many clicks you have left. You can press - on your keypad to cancel clicking anytime.