u/Fruit_YoYo_Bears

Hi guys, me and a friend are going to a concert at the O2, however our train is at half eleven at night back to Norwich and the concert should finish around half ten. Is this enough time to get to the station on the tube, and if not are there any any alternatives?

Edit: Since it's a kpop concert they usually start on the dot at around 7-7:30 and last 2.5 hours so after more research it's probably doable