I live the first exit on the coast in NH (not Seabrook.) I am also from here, I can answer any questions you may have as well.
I leave my door 1 hour prior to show or 1:25 before if it's peak rush hour. The traffic on 95 and route 1 is very predicable. Normal rush hour will make your :45 commute closer to 1:00-1:15. Coming home isn't as bad and 1:00 in rush hour is pretty standard.