Depending on the format of the movie, the frame rate ranges between 24 and 60 frames per second. However, this is quite high for a GIF file to handle, so 10 to 20 will give a smooth enough animation.
Ah, those are milliseconds, not frames per second. A 30 fps animation would have a 1000/30 = 33⅓ ms delay between each frame. A smaller delay (ms) is faster.