How many days can I go consuming only soylent?

I once drank soylent before going partying, and I didn't have to use the bathroom at all.

That was really good because taking off my outfit to use the bathroom sucks.

Building upon that, if I just kept drinking soylent, I could party non-stop without bathroom breaks.

So how many days can my digestive system, and body, handle being on a soylent only diet?

Will my guts atrophy?