A guy on YT actually tried it experimentally a few years ago (how many slaps, not how fast one slap); and it works to some degree! The main problem becomes to make a slapping machine that can survive long enough:
https://www.youtube.com/watch?v=LHFhnnTWMgI&pp=ygURc2xhcCBjb29rIGNoaWNrZW7SBwkJzgkBhyohjO8%3D