I think the Masters and FAI guys are pushing it close to battery capacity. I have never ever used 3000mah or more and can fly the Sportsman pattern at least twice with that. Haven't flown the full intermediate schedule yet, but probably still under 3000mah for me. Of course I'm running higher voltage (10S) to decrease current and run cooler.

They do fly two lines at once, so you may have to wait for runway to clear.

You should not have a problem flying the first 2 classes with 4000mah.