For my 1st IVF, I stimmed 13 days, then trigger, so 15 days from start of trigger to ER. This time, I started microdose lupron 2 days before stims, stimmed for 11 days, then trigger.
One interesting point is that if this is your first time, you might go a little longer because your RE will likely start you off at on a conservative dose, and increase as/if needed.
For example, my fist IVF I started out on 150 each of Menopur (2 vials) and Follistim, and ended up increasing until I was taking twice that amount, and then I coasted down at the end. This last time, my dose was consistent the entire time I stimmed (225 each), with the exception of Follistim coasting at the end, like last time.
Like PP said, it's frustrating to have no control over the situation, but it's ultimately worth all the inconvenience when it results in a baby. It's really only about 2 weeks out of your life and it will go by pretty quickly, even if it doesn't feel that way at first.