How Often Do You Change your Banners?
 

Do you rotate new banners on your sites every month? 3 months? Assuming you are promoting the same sponsor.

Are there banners that you never remove?

I'm trying to figure out if it's best to leave some banners up for a long time (around 6 months or more) the way companies run TV ads. Repetition is sometimes needed to let a product sink in to the surfer's (consumer's) mind.

:helpme

none - the hun gets revenue from pre-paid gallery placements on the top 15 spaces and banners. the rest of the galleries are free placements.