Our Team has 30 scheduled hours per week, but I know that I go home and CAD so I don't waste time on a computer at a meeting, and I know that the lead mentor goes home and continuously thinks about solutions to problems and our drive coach goes home and thinks about strategy... So I think it's quite a few.
Though, 180 hours to build a robot doesn't seem like a whole lot... Even if I multiply it by the number of people working during the meetings (around 10) that's 1,800 hours... Yikes.
Oh well. I'm sure we're not the worst of it.. right?