Steve,

In one Master's routine, when I recharge it puts in an average of 4,000 mah into each of the two 5s4p's. At an 8 amp charge rate, that's about 30 minutes. In reality, about 20 minutes and the packs could fly another contest flight.

When practicing I usually fly 2 complete Masters patterns, about a 13 minute flight. In 40 minutes I the pack would be charged enough to do that again.

Hope that helps!