I think the longest I've been off of it was about a year, and that was only because I didn't have a computer. But after eleven years I refuse to let it up, taking breaks every few months before coming back, usually for four-six months or longer if I'm currently doing a quest. Like now. I will paint my Zafara Grey.
I was going to try out a year's premium until I learned you had to give up your fifth pet when it was over. :U
Neopets will always have a place in my heart, It was one of the first sites I got seriously involved in when I was younger^^ My first pet ever was a Uni or whatever the winged unicorn pony thing was called named SweetCake , and another favorite of mine was Tigress, my Kougra X3
The biggest Neopets player I personally know went OMG RUINED FOREVER the moment wearable clothes were made compulsory (mainly caring about the sprite changes). Being easily-influenced, I followed suit.
He had four Pteris, one of which was electric...
Literally. He never even seemed to consider having anything but Pteris.