I would like to find out what is a good frame per second figure to produce good quality animation but not take hours and hours to render!
We normally don't export animations from Revit; we use Navisworks. We usually export those at 16 fps. Anything below that would cause the video not running smooth. While some people would argue about 16 fps being less than required, we have found this quite satisfactory and have created many animations for several clients with totally smooth and watchable videos.