Would 500 paintballs be enough for a couple of hours (approx 4 hours) at delta force?

Basically im going paintballing with some friends, my parents are paying for it all and the max paintball package i can get (expense wise) is 500 which is £35 per person and im taking 4 other friends with me, 2 which have already been at least once before and me and 2 others whom its the first time going. I cant get anymore cause its gonna be a bit too expensive. So will 500 be enough for us without the need to buy more? Btw ive been researching and some people say the older you are the more you use? I dont get that what age u use more, so 3 of us are 15, 1 is 16 and other is 12. The only reason im asking is because ive seen some posts which say i need 3000!? But it does say on the delta force website that the average between all ages is 400-500 paintballs