Hurray for poop! I will say that last summer with DS and his obstruction, it was only a very short period of time with not pooping alltogether before we realized he was in trouble.
But he threw up overnight on Friday. Stooled very early Saturday morning. Threw up again later in the afternoon and early evening. So we thought he had a stomach bug. But then I noticed his tummy was round and distended and he hadn't stooled. So Sunday I got him some milk of magnesia. But he threw that up. Complained his stomach hurt, so we headed to the clinic where they determined that evening he had an obstruction.
But in his case, his problems, were caused by adhesions and had been causing issues for quite some time, but he was still stooling, just vomited if he'd eaten a lot of food. But less than 36 hours of not stooling in his case and he had an obstruction.