i think the reason they wait a two days is to be safe... i dont think thier meals are digested after that, they have a slow matabolism, and i know when i handle mine, i cant still feel thier last meal in them, just not as big for sure. they can regurg at any time really, i had a rat snake who would after 4 days after a meal if she was being handled and she felt it was not to her liking. i think stress triggers it, with a full stomach, they are unable to get away from preditors as fast, without, they can go faster..