Can fat people go a long time without eating?

If someone who weighs say 500+lbs ate nothing but vitamin supplements and drank water. Could they go a very long time without eating and use all of their stored fat?

What’s the extreme of this? Could a 700lb person go potentially years without eating any food? I know around 3500 cals is 1lb of fat so if someone doesn’t eat for 2 days they’d more or less lose 1lb of fat. At 700lbs someone should easily be able to go a year without eating right?