Fasting really depends on many things, the animal, the way the animal is kept.
Do they all fast? No but some do and the more animals you have the more likely you are to encounter a fast same thing for picky eater.
The most common fast is usually the wall which is usually experienced around 800/1000 grams. Every now and than you will see smaller animal going on fast but it is not as common.
The keys IMO to have animals feeding with consistency and avoid fast are smaller meals weekly or even every 10 days for males, skipping feeding every now and than, keeping your animal in cramped spaces (especially males during breeding season)
I think that the most important thing to remember is that BP are often overfed in captivity and fast should be expected at a point or another even when the animal's husbandry is optimum.