Its 55 miles to the south entrance of YNP from Jackson, then another 50 miles on to Old Faithful. It can take 2.5 to 3 hrs depending on the time of year and time of day you depart. A good length of the route is 45mph and you travel through Grand Teton Natl Park which has many beautiful scenic turn offs that can make the drive longer but beautifully worth it!
Probably like 60-90 minutes. Depending on traffic and wildlife sightings.
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