User blog comment:SpiritedDreaming/RWBY: Attack on Kevin Tower Defense Game/@comment-26397825-20161011121047/@comment-25936766-20161011131548

For an entire week....nah. I was thinking of about 3 days, including the one where it activated. As compensation, letters can be obtained inmediately afterwards.

If instead it lasted about 5+ days, then I would like for no letter to be obtained during the duration. Because then it could end up activating almost right after it ended, seeing how they get the SEs roughly every week.

As for Grimm respawning....let me see: I was thinking of 3 creeps per day, 2 10HP Grimm per day of each, 2 15HP Grimm per 2 days (Ex: Mon/Yes, Tues/No, Wed/Yes...) of each, and the big Grimm 1 of each every 3 or 4 days (so twice or once a week, respectively).

As compensation, the initial numbers of every Grimm would be much smaller, meaning they are easy to deal with at first, but the numbers can escalate, like in the show.