My longest was about 5 months or so. Geez, that was frustrating. I wasn't keeping track of weights back a few years ago. I only had one as a pet. I took him to a vet for a regular check up, which happened to fall smack dab in the middle of his fasting and the vet told me he was healthy and had a good weight.

Obviously he didn't lose much, but I would have to agree with everyone else. Once their feeding response comes back, it comes back with a vengeance.

He's off feed again this year, although he started later than usual.