Every time my reading list says there's a new chapter out I drop whatever I'm doing and read it. When a series catches my fancy I usually never stop until I catch up with the scanlations that are out. On time I spent weeks on end re-reading One Piece.
1.5 hours every day probably (considering all manga related stuff). It used to be a lot more, but I'm currently on a long break from watching anime (though I plan to catch up someday ) and I can't allow myself to spend too much time on reading manga.
I probably spend over 40 hours a week on average. Even with a busy school schedule, I try to make as much time as I can for manga related activities. With reading manga, watching anime, drawing, and cosplays it's easily surpasses 40 hours a week.
Lol nice joke about last week's poll "curves of that bell" xD
As for manga, I'm guessing people are joshing that they spend as much as some people do at work (i.e. 8 hours a day from 8 am to 4pm, 5 days a week at least)? No offense because I find it hard to believe that it's in the majority right now even if they're scanlators.