It takes me 10 minutes to exit the ground from CB level 3, walk to the bus going to Hale, and wait the 15 minutes or so before it sets off.
Connell College is a few hundred yards from the ground, perhaps a little further than the bus I catch, but it isn't going to take you 15 or more minutes to walk there.
The first time I planned on using the service last season, I thought along similar lines and was worried I wouldn't reach the bus in time.
It was a worry that disappeared the first time I caught the bus home, and it is, by some measure, my preferred transport home on a much more comfortable and reliable service than the tram.
Give it a go. You'll make the bus in time, and you'll never want to take the tram home again.