3 days and up till 6am with gambit on the last while filming. I think it went well The Forcer Motor drives all 12 wheels through 2 differentials and when stopped the motor also is used to rotate the crane assembly via gears. Hydros control the other functions including the the 12 wheels steering that does turn at different rates.. Also the whole crane is controlled via my MOMO steering wheel so turning is analog and so is throttle and Brakes via what I am calling a "FLINTSTONE brake system" where two 1500 weight props are pushed into the ground via hydraulics. What it is lifting is 512+300 so 800 weight which is about the same as the jeep. It was upped to 2000 total later when bringing it to the water. The submarine is incomplete and needs more fine tuning. It uses only text receivers for control.