2 hours run time.... about 25 fills each on two impacts and 25 more on a Crown Continuum... thus far I am impressed.. my only complaint is it fills too fast.... fill to 250 bar when the dust settles is really 230 bar... due to a "hot" fill... this unit goes from 150-250 bar in about 2 min..... whatever they changed with the recall when these first came out they have fixed in spades.... this fills FAST