Depends on you screen, and how close you are, but 24fps is genrally thought to be the base number for simulating smooth movement, though being closer will afect things, especially the flicker.
Most tft screens refresh at about 60Hz so any more FPS than that is a waste in most circumstances, so can healthily be sacrificed for other improvemnts.
If the split seconds really matter then higher framrates (as they often a sign of how quickly a games processing) can relate to reactions being a tiny bit quicker, but reactions that quicker are rarely that important.