My guess is the cool down is how long until ALL the revive charges refresh and it gets more and more penalized the more you are forced to use. Die once? Eh it basically didn't happen 2 hours later, die 8 times? Now you are on the run for 256 hours if it just doubles the timer or 510 hours if each revive adds double like I think it said(2+4+8+16...+256). So if it's the worst case for him. Die 8 times and he is on the run with no extra lives for a whole 2 weeks