Mine took a few days till I stopped noticing the difference. It didn't hurt too bad after a few hours. I used tea tree oil on the outside and something called TCP on the inside (from the UK). It worked really well, I had no infections and a small amount of swelling
But like some other people have said all ready, once you notice the back part of the ring catching on your teeth, get your post shortened asap, otherwise it is very annnoying!
Hope you enjoy it more soon!