my commute by public transit is 45 minutes to an hour. by bike it's about the same. Less if I don't consider time spent locking the bike up and stripping it of removable valuable (and therefore stealable) things, and changing into work appropriate clothes. Wouldn't want to regularly do more than that as I value my time with my family too much. As it is, by public transit that feels too long. On nice days I'll take the long way home on my bike sometimes (or the long way in if I don't mind being a bit late), but it's not a regular thing.