Talk:Nova/Prime/@comment-173.61.203.71-20150701182010/@comment-26487898-20150701190957

It's a rotation.

It goes like this: AABC

Rotation A : 5 minutes Rotation A 2 : 10 minutes Rotation B : 15 minutes Rotation C : 20 minutes

That is for survival.

Defense is -

Rotation A : wave 5 Rotation A 2 : wave 10 Rotation B : wave 15 Rotation C : wave 20