Laloo's jigsaw

After completing a jigsaw puzzle he'd been working on for quite some time, Laloo proudly shows off the finished puzzle to a friend.
"It took me ONLY 5 MONTHS TO DO IT," Laloo brags.
"FIVE MONTHS? THAT'S TOO LONG." the friend exclaims.
"YOU ARE A FOOL". Laloo replies. "SEE THIS CARTON, IT IS WRITTEN-`FOR 4-7 YRS'."