I put 4 fans on the underside of a wing and was able to fly it for over 10 minutes!
When my battery was depleted and I was gliding to recharge the normal wing timer started but when the fans were powered again the timer stopped and I could fly indefinitely!
Either use a large zonite charge to refill your battery, or just let go of the stick and glide to recharge. Glidng will deplete the wing timer again though.