This all started the other day when I got home from work . Got on to simple planes and took off to fly around one of my jets . I minimized the screen and forgot I had it running . I didn't have unlimited fuel just normal parts except for enlarged engines , I fell to sleep and woke up with it flying until it was out of gas . Out of curiosity Yesterday I took one of my planes up Minimized it and went to sleep . I woke up in the middle of the night ( day when you work on the graveyard shift ) and realized it flew for 3 hours and 30 min at around 40000 feet . My starting speed with it fully loaded cruising was 355 mph and when most of the fuel burned off to 5 percent when I woke up it was at 342 a couple thousand feet higher I figured I travelled about 1100 miles roughly . What's the longest you were able to fly ?