I have seen quite a few Boston terriers that have loads of energy. I'm no expert on the breed but based on what i have seen I think it could jog for 20 min.....
They are prone to overheating in hot and cold temperatures though. Their flat faces can also cause some breathing issues - but the ones I have seen have been very very active.
Marty11 - besides your BT, do u know of others that couldn't handle a 20 min jog?