Quote Originally Posted by Hairb View Post
Because DM's rarely keep track of time like this (YMMV), why not say once every 10 turns?

An artful bit of homebrew, in any case.
It is doubly good to have it be 10 rounds and not 1 minute as from what I have heard on the grapevine in 4E they will not be saying "1 minute" but instead "10 rounds."