So after you've done your fast passes, what do you do? Should I go back into TP and update the plan with my exact FP time? I'm scared to touch that thing now that it's done. Some days I go to make one change and end up adjusting the whole thing, lol. Update, evaluate, back away!
As long as the time on my plan is within the FP window I actually got, and assuming I'm happy with the plan as it is, I just make a note of the window.
Obviously if it isn't, you have to update it. I do this if the plan has me arriving in the grace period too because I don't want to risk missing it altogether.