HW100KT .177 (2016'ish), 4 mags (48 shots) from a fill of 200 down to just over 100 bar. Then it seems as good of a time as any to refill.
I've seen people down my local manage to eek it out to 56 using a karbine, most of the full length ones seem to do around 8 mags worth in .177, .22 will get a extra mag or two.