A 1C charge rate takes one hour for the entire battery's capacity. The batteries are not drained that far. Thus recharging takes less than an hour at 1C.
Originally Posted by
Tzicul
In theory, at 1C any battery will charge in 1 hour, at 2C it will take 1/2 hour, at 4C - 15 minutes and so on. So I suppose you have a problem if your battery is fully charged in 10 minutes, probably it doesn't have the same capacity as new