How long can a Betta fish live without food?

[Mistress of Rain]

i know my friend uses the travel feeders for her betas when she doesn't take them home with her on short breaks.... and if I was around you i would give you a deal.... but sadly i'm not. crying  

[Cowgirl-with-heart]

you could look into getting an automatic feeder,or maybe ask a friend to stop by every couple days to feed it? or even every day if you want,IDK  

[kage no neko]

Due to unfortunate circumstances, we discovered our fish were iffy around the one month mark. A few died, the others were just really hungry.

We went on vacation for the holidays... we had bought a vacation feeder thing... but forgot it before we left. So it was sitting in the kitchen the whole time, which really doesn't do much good for the fish.  

[Vanilla eXee]

2 weeks is the longest I would go. Fish can survive long periods without food, but it's impossible to tell which fish will last how long. Also going too long without food just isn't healthy. I don't like vacation feeders or automatic feeders. Autos can break, which results in food decaying in the tank while you're gone, not good for water quality.  

[Jeeed]

Depends on a few factors, such as how established the tank is, how large it is, and whether there are live plants or not, as well as temperature. A tank can provide enough food for quite a while if it's well established. For example, I once went about 3-4 months without feeding my fish and I noticed no problems at all. But as for the betta, I think a week would be okay, but anymore would be a risk.  

[Yunui]

I've heard they can go up to 2 weeks or more, but I wouldn't risk going over a week.