Default framerate on Blender is 24, but you can use any value you want. Frame data in DAE is actually stored in seconds, not frames (looks like PayDay already figured that out), but generally you want to know what the original framerate was before importing, otherwise you end up with keyframes being placed between actual frames.
For finding the target framerate, it looks like the 3DS Max DAEs actually do have a
<frame_rate> element under
<library_visual_scenes>. I did not put that in the Blender exporter. I'll add that when the Great Refactoring happens.