Jigsaw puzzle

After completing a jigsaw puzzle he'd been working on for quite some time, Ah Beng proudly shows off the finished puzzle to a friend.

"It took me ONLY 5 MONTHS TO DO IT", Ah Beng brags.

"FIVE MONTHS? THAT'S TOO LONG", the friend exclaims.

"YOU ARE A FOOL." Ah Beng replies, "SEE THIS BOX, IT IS WRITTEN FOR 4-7 YRS".