I picked up the hire car after landing and clearing immigration at 2pm, drove about 2/3 of the way and stopped at 6:30 - as this was 2:30am UK time I thought that was enough! With the time difference I was awake again at 2:30 and in Reno for 5am, return was a straight drive leaving as soon as the last race finished at 4:30, back in Vegas for 11:30!