Best refresh rate for banner ads

Hi,
What do you guys suggest/use refresh rate for banner ads, More specifically for admob and FAN. And what impact does refresh rate has overall.

Regards

We recommend 15 seconds refresh rate at Appodeal. But to be honest, this depends on many factors like session length, banner placement, user segmentation, etc. But our general research is that 15 seconds generally works for most apps.
Refresh rate does impact your revenue. The best you can do is A/B test in your app.