Well, the average fight between 2 persons takes about 10 seconds. Now, I'm going to oversimplify this, but here's a rough mathematical estimate. Now, let's say that the enemies are all far weaker than you and your allies, only about a third as strong and skilled each. So that would give every ally "3 HP" and every enemy "1 HP", and every fight a 75% chance for your allies to win, and let's define winning as reducing the HP by 1.
Assuming that there only are 1 on 1 fights, with 32 allies, and that only 1 fight is going on at once, that gives the allies 128 HP. One fight on average per 10 seconds, with a 75% chance to win, means that without healing the allies can, under these circumstances, survive for 512 fights, 5120 seconds, or about 85 minutes until everyone died. In that time they would have killed 384 enemies.
Of course, this is very oversimplified, but I think it shows my point in this case.