I do the 50 dodges then pause strategy, but I also like to throw in a few "extra credit" dodges each time. That means I dodge about 5-10 more bolts after the first 50 just to ensure that I haven't counted too low. It also helps bring your total up in case you get hit at number 198 or something. It is pretty nerve wracking, but in practice it's not all that difficult. I've fared far worse with the chocobo race so far.