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I mean 5 hours is pretty much a days work realistically so if you look at it that way it seems pretty reasonable to me. Project 1 is basically a "you'll take a day to do this" project 3 is basically a week's work, etc.

If it comes with some instructions and hints it would line up with my estimates pretty closely, that said I've done a bit of this sort of work before so I might have less unknown unknowns in my estimate.

Yes, me too. Although I'd hypothesize you would like to explore tangential parts of the lessons rather than heads down follow without mental digestion.

"Time estimates are in person hours based on averages from 140 college students. Projects longer than 6 hours could be done by pairs or small teams, or by an individual over multiple weeks. Some projects also must be run for significant unattended time to produce results."