doesn't look like you did My1stGame yet, which is fine -- it's definitely over an hour, probably ~2 for a newcomer if you don't use the cheat system. (my final save is 1:34 as dev.) just so you know, since you mentioned something about >1hr games!
(actually, for streaming, i kinda suggest just immediately getting +2 levels from montrys when you first get there. it's not how it's meant to be played, but it IS a hard game so it'd be a faster stream if that's what you want. up to you =P)