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Idk I don't tend to look at the clock when I fall asleep, but I do know that whenever I accidentally fall asleep while watching, say, a PBS spacetime video, I pass out for no less then about an hour
Also I have no clue how the other people here figure out how long it takes them to go to sleep, because as far as I know, looking at the clock just keeps you awake for longer
You can test yourself at the expense of actually getting sleep. As you settle to sleep set a timer and hold a teaspoon (or similar metal object) in your hand hanging out of the side of the bed over a metal tray. When you fall asleep the spoon will slip from your hand and clatter, causing you to wake. You can then check how long that took.