mostholy2 said:1) What's the typical amount of time to devote to posting and reading that a player needs to devote to playing D&D by post?
Depends upon the player, GM, and group. I asked lotsa kveshtions, so devoted hours/day... Then again, I was the most active player, and ticked the others off, because of it (but when I left, the games always died off, some more slowly, others quickly).
mostholy2 said:2) How have your experiences playing by post been like? How do they compare with playing in a standard gaming session?
PbP isn't for me. It can take days to get answers to questions, resolve misunderstandings, etc. Also, you generally don't know the people you play with, and a lot of them don't care if you're having fun or not. You have no way of knowing the players' and GM's gaming styles before you join a game, and dust-ups between PCs tend to end in either one or more PC deaths, or a player quitting the game.
mostholy2 said:3) How do you work tatical maps and battles as there is no board, just word descriptions of actions going on?
As someone else said, there are various methods, from all-text descriptions, to ASCII maps, to .JPG graphics.