2-3,000 pellets, slugs, cartridges is a lot for a day. When shooting ground squirrels, we seldom were above 1,000 rounds of powder burner ammo in 10 AM (when it was warm enough that they were out) to dusk. Shooting quite consistently at the range, about 6 hours per day, I shoot 500-700 pellets.
I take 3 or 4 full-power .22 PCPs and shoot & reload one gun while another is on the GX CS3 compressor.
*NB. I am not disputing the numbers anyone has referenced, simply adding what might relate to the database.
I run the compressor (or my CS1 clone spare) from 120 VAC unless the power happens to be down, in which case I use the vehicle. I can fill several times before needing to run the vehicle to avoid hiking. IME, unless one is luckier than I am, spares are necessary to keep from being out of commission, unlike powder burners.