Just remember that it will be around 3 days per turn (maybe a bit less early on), so for example if something takes 10 turns to build in normal speed, and takes 15 turns in epic speed, that is an extra 2 weeks in real time. One problem all teams have experience in the civ3 MTDG at one point or another is a low number of active participants, which can make things difficult. While i personally enjoy playing games at epic speed, given the amount of time it will take to get through a turn makes me think a faster speed would be wiser, otherwise a lot of people will get bored and then you will have the same low participation problems civ3 has had.