64 days

a group of 3 blonde walk into a bar a are chanting 64 days 64 days 64 day... the bar tender looks at them briefly then goes back to work then the next night the 3 blondes go into the chanting 64 days 64days 64 days .. again the bar tender looks at them then goes back to work once again the 3 blondes go back into the bar chanting 64 days 64 days 64 days .. finally the bar tender gets up his courage and questions why are u ladies chant 64 days? they respond we were doing a puzzel and it said 5 to 7 years and we did it in 64 days.