Shortest time you can drive to visit x amount of states/places

[pderocco]

Back to speculative territory, here's a route that would touch 13 states plus DC:

ME NH VT MA RI CT NY NJ PA DE MD DC VA WV

Kittery ME
    I-95
North Hampton NH
    NH-101
Manchester NH
    I-93
Concord NH
    US-202, NH-9, VT-9
Brattleboro VT
    I-91
Greenfield MA
    MA-2A, MA-2
Leominster MA
    I-190, I-290
Worcester MA
    MA-146, RI-146
Providence RI
    I-95
New Haven CT
    I-95
New York NY
    I-95
Newark NJ
    I-95
Philadelphia PA
    I-95
Wilmington DE
    I-95
Baltimore MD
    US-1
Washington DC
    US-1
Arlington VA
    GW Pkwy
    I-495
    I-270
Frederick MD
    US-15, US-340
Harpers Ferry WV

Google reports that as 733 mi, 12:41 driving time.