there is some STD Bunch league I think, and they play games over FICS or ICC...
just create a fics account, and ask in help channel which is the channel for long games, the Service Representatives there will point you to the right place/persons.
There are several time control systems for 'standard' games. Many GM tournaments (like Morelia-Linares currently going on) have 2 hours for the first 40 moves, 1 hour for the next 20 and 30 minutes for the rest of the game. In some tournaments, there is an additional 30 seconds per move on the last part of the game.
FIDE official tournaments (Chess Olympiad, World Championship, zonal and interzonal, ....) have 1h30' for the first 40 moves followed by 30 minutes for the rest of the game with 30 seconds addition for each move, starting move one.