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As for the game time, I'll say again that the less time per turn, the faster the game progresses.
Many are already used to playing Heroes "in the background" while doing household chores, browsing the internet; for them, a slow and relaxed pace is more than suitable. Often, games are played without any time control at all.
A stricter time control (2 minutes in SoD, 3-5 minutes added in ToE) is better suited for club tournaments, where the overall duration of the match is limited by external factors.
It's quite difficult to find someone online to play a blitz game. I've played with Mr.Nobody a few times with a time control of something like 600+200, and he's also a fan. Other players couldn't handle more than 1-2 games without damaging their self-esteem.