mah and runtime for racing 1/8 Buggy?

[jhautz]

Looking for info on what kind of racing run time people who are racing brushless 1/8 buggys get allong with their setup info. I am converting one right now and am trying to decide how big of a battery I should plan for needing in the battery tray.

The local track runs 20 minute mains on 1/8 buggies. Any idea what kind of battery size I would need to get through a 20 miute race?

Im going to be running a Maxtrix w a Mamba maxx on 4 or 5s. I have options as far as motors go so I can pretty much set it up for whatever KV in need. I have a 1700 kv, 2000kv and 2200kv motors.

Also, what kind of speeds should I be targeting for a rather large track. (250ft x 125ft) and a smaller indoor track (125 x 65)

Edit: Correction... Local track runs 15 minute mains, not 20.