How long will a three days grace concert be?

Im going to a Three Days Grace concert in July at the Delaware State Fair. Its a 2 band show, with TDG and an opening act (the Trews). The ticket says the doors open at 6:30 with the show beginning at 7:30 .... so, what time will it be over? The reason I'm asking is because around here if youre under a certain age, you can't drive past midnight, and I live an hour and a half away, so Idk if I need to get a ride from someone or not.