Most games I've been in take around 6 - 18 months of regular (weekly) meetups (around 5/6 hours a go) to complete. D&D is meant to be a game played over a period of time. Players gain a level every few months; Maybe even less.
DM would need to be very well versed in all the rules of D&D, and own the various books. Also, all players should have, and have read at a minimum the rulebook for the game you are playing.
Would love to play, but can't afford the time atm :(
Otherwise, you can join a game at that Game shop in railway arcade? Groups are always looking for players.
Oh, and start with 4th Edition. Don't bother about the earlier editions if you are new. 4th is nice and simplified, and relatively easy to get into.