User blog comment:SpiritedDreaming/RWBY: Attack on Kevin Tower Defense Game/@comment-26397825-20161011121047/@comment-26397825-20161011130556

Going by that...how about 2 Creeps spawn 2 a day. Then the 10HP Grimm spawn 2 every two days, the 15HP Grimm spawn 2 every three days, and the 20HP Grimm spawn 1 once a week. The Beringel can spawn either on the first of each months or 1 every two weeks.

That means that at the end of the two weeks, 28 Creeps, 14 10HP Grimm, 12 15HP Grimm and 2 20HP Grimm have spawned, as well as a Beringel on 35HP if we choose to go with the two week cycle.

The Silver Eyes could stop the respawn for an entire week, including the Beringel if it's due to appear? And then just do 5 lots of 10 damage to random Grimm. They are meant to be somewhat stranger than Glynda, after all.