51 Days!

A group of blondes walks into a bar and tells the bartender to line up a row
of drinks for all of them.  The gals lift their glasses and toast, "HERE'S TO
51 DAYS!!!" and they chug down their drinks.  Once again, they tell the
bartender to "line 'em up!" and once again they toast "Here's to 51 days!"

Finally curiosity gets the best of the bartender and he asks, "Hey, what's the
big deal about 51 days?"  One of the blondes explains, "We just finished a
jigsaw puzzle that said '2-4 years' on the box, but we finished it in only
51 days!"