How Much Time Until Your Tummy Lets You Know That You Ate or Drank Something Wrong?

I'm 2 months out and am gradually adding more food. Occasionally, I'll get horrible cramps and other not pleasant GI symptoms. However, I never had anything different on those days than I had been tolerating well. But, usually, I had a new thing 1 or 2 days before. Should it take that much time to upset my system? I would think the reaction would be within a few hours. I'm wondering if it's unrelated, and I'm just trying to tie it to something?

20 minutes for me....

Anywhere from 20 minutes to an hour.

Less than 5 minutes for the tummy and 1-2 hours for the guts.  What I really reacted to was any sugar alcohols, or sugar free products. 

Not much bothers my stomach these days...  but if I eat carbs or sugar, I will get signals 1 to 1.5 hours later that there is going to be a blow out. 

In the early days, my stomach was very sensitive.  If I ate anything oily, it came back up within 7 minutes.  It only takes 5 to 8 minutes for food to hit your stomach. 

I do remember having the same symptoms and trying to figure out why I was having diarrhea today when I have been eating the same well tolerated foods for the past 2 days.  And trying to find a link as to why this would come and go.  I found out that what I ate today can affect the BMs of food I ate 2 days ago (like sugar).  And if I forget to take my vitamins for a day, I will get diarrhea in the mornings that are not related to any food intake.  It's all a balancing act.  But it did smooth out as time went on. 

About two hours for me.

I suspect gas can be 20 minutes or less - could be coincidence, but it nearly always coincides.

BMs can be 3 or 4 hours for me, or often they cause me issues during the night.  I get away with most stuff during the day and have plenty of bathroom trips when I'd really rather be sleeping!! :-S  I guess dietary indiscretions tend to happen in the afternoon/evening.