The book says 45 minutes to charge after one hour of operation.
We are finding however in Perth where the minimum temperature during our testing was 35° that it would take approximately 60 minutes.
The reason is, the charging cycle is slowed down because of high temperatures to prevent damage to the batteries. The same happens in low temperatures.
So, at 21°C you will get one hour use of the aircraft and the recharge will take 45 minutes.
At 35° you will get one hour use of the aircraft and the recharge will take approximately 60 minutes.