I have 8 race days on mine. that is 3, 5 min quals and 15min mains with a few 25 min mains (req battery swap) and 3 practice packs per race day. I also have 12 4s 5000 packs and 4 5s 4350 in my yard.
This is in a Losi 8ight with a Neu 1512 2.5d in it.
I don't understand why some work and some don't.