at PCL it was kinda up to you... I am based in DTW (initially) but asked and did all my OE in memphis (cause I live there). Others did OE in MSP that lived up there. Those who were going to just stay in DTW for the forseeable future just did it in DTW. Kinda vague but if there are enough check airmen I am sure you can request to do it at different bases, if you dont ask for something you will prob do it in the base in which you are based. As far as time, they will just bump an FO off a line trip and you will fly it with the check airmen. I had to do 30 hours and after the trip I actually had a little over 30 hours. Hope that helps.