It's hard to answer your question because there are so many variables. Your own reaction changes each time. It depends on how much gluten you ingested, how much damage/inflamation you have in your system, hormones, and a variety of other things.
So I am trying to deal with my celiac. I am usually pretty careful and good about what I eat. However when I do get "glutened" the reaction can be mild or super harsh!! I am just trying to get a rough idea of how long on average reactions tend to last.
You could have a reaction that lasts hours, days, or weeks. All would be considered "normal" reactions.
Generally, as time goes on without gluten getting into your system, your "fighting cells" rest up and are ready to wage war on any gluten that does gets in. Your reaction would be stronger.