We removed gluten for 14 days then reintroduced it on day 15 (as per directions from our nutritionist) For myself I had almost instant results, for my daughter due to her inability to communicate it was a bit harder to know what her results were - i had to look for very subtle changes i.e.: colour of BM's.
This is what we did but I didn't realise there was a method to it. We put our son on a GF diet then we were moving 2 weeks later and as we hadn't seen any changes we put him back on gluten. It was awful! He descended into a fog and it was very clear gluten wasn't good for him. So we went GF again and over the following couple of months he made amazing gains with his development. Then we went onto GAPS and it's been incredible.

it can be tricky getting used to a new way of eating but it is worth it.
Totally agree.