Has anyone reached B2+ (or equivalent) in a language while studying less than 1 hour a day?

Based on most estimates, reaching B2 in a (TL) language generally requires high hundreds (700-900 hours) or low thousands (1000-2000 hours) of hours to get there depending on your native language and what language you want to learn.

Obviously getting C1-C2 takes WAY longer.

Mathematically speaking, for someone doing 30 minutes a day, to get to B2 for a language that requires 700 hours to reach that level, they would need to spend almost FOUR YEARS to get there. And that is if they have perfect consistency.

Realistically tho spending "only" 30 minutes a day also has problems like task switching costs, warm up, etc that can make it so you're not even actively learning for a chunk of those 30 minutes.

So I'm curious are there any people who have reached B2+ in a language doing less than 1 hour a day and if so, how long did it take you (in terms of calendar time) to get there and how much time a day were you