It'll probably be something along the lines of limiting the number of opponents a user can kill per wave, which would pretty much solve the first problem. To solve the problem of missing out on waves, they should stagger the opponents in a wave--like release 1/12 of the wave every hour or something until they run out of opponents in that wave--so it's fairer to those who live in different time zones.
Either that, or with the limits on the number of opponents a person can kill per wave they can just leave the number of opponents to be infinite until they decide to retired the wave? That would be the best
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