When making a major change in ad placement

I generally see the epc go very low for a while

[NoLimits]

Does anyone else notice the same.

Also, if you do notice the same - how long does it generally take to recover to "normal" epc for you.

I made a major change for testing purposes and am wondering how long I should wait to start making comparisons.

edit ---

I just got my first stats update since implimentation of a new layout and it looks promising.

[ann]

Mine went up right away.

Ann