Which device do you want to check?
Each one takes about two to five minutes, or a bit longer if you get distracted halfway through and start tidying up your home screen, which, fair warning, happens to almost everyone.
You'll want the device itself in front of you, because I'll be asking you to open a few settings pages and tell me what you see. Don't worry about getting it "right". There's no score for neatness, and if you can't find something there's always a button for that.
Your answers stay on the page while you do the check. They are not saved or sent anywhere, not even to us. Close the tab and they're gone, like they were never there.
Using a Windows PC? Then, honestly, the free scanner might save you some clicking, because it can check more things for you automatically while you sit back and drink your tea.