My stock batt and charger took around 1.5 to 2 hours to charge; seemed like all day.
I've never gotten more than 4 to 5 mins of flight time.
If the first flight was just kinda hop'n around and sliding, shut down, reset heli in the middle of the pad, hop'n slide, shut down, reset, etc... I could see 15 mins or so. But at a constant hover, no more than 3 to 4 minutes is normal.