Ok, so our Western/Northwestern friends are 1.5 hours.
Southernmost friends (DC) is about an hour (maybe more for Cugel since he's around the DC beltway a little further) - so say about 1.5 hours for them.
Fredneck is about 1-1.5 hours.
York, 1 hour
Harrisburg, 1.5 hours - I've made the trip to the I-83 bridge in the Burgh in like 1h 24m before
Sounds like Joppa is within 1.5 hours from everyone.