Battery charging at flying site

When I balance charge my 130 batteries it takes just shy of an hour at .5a so my question is at what rates do you guys charge your batteries at the sport centre and do you use balance or fast charging. I use 450mAh 2s cells.

Most of the new generation packs can be charged at 5C or more - gens ace for instance. Therefore if you use 450m/a capacity packs, 1C would be 450m/a and would take one hour.
2C = 900m/a and would charge from empty in around 30 minutes
4C = 1.8A and would be 15 minutes ...... and so on.

I use a parallel charge board, and charge up to 6+ or so packs at once if required.

DO CHECK what the maximum charge rate is for your packs, as most lipos ( earlier generation especially ) were only chargeable at 1C
EG: at the same current as the pack capacity.
Charging these packs at higher than 1C could be dangerous at worst, or damage the packs at least.