Test and Tren In your delt will cause a bit of soreness and a bit of swelling. WHen i would shoot my delts, i never had to rub it much, maybe for 30 sec or so. It will burn going in and stay burning for anywhere from 5 to 30 min. One time, I shot my shoulder with tren and I was bitching and complaining for a good 45 min. My wife was like..."well thats what you get." hahaha