Some information for you - from Edmund.
It is about 1,000 miles from Nekoma to Jarret WY. Among other things, you might note that on a horse it will probably take John over a month to get there. Even at an average speed of 30 mph it will only take you 33 hours to make the trip, so if you leave right now you will probably beat John there by a good three weeks at least.
Your most direct route takes you past Bismarck, a city which has almost certainly been Ghost Rock bombed (which is good news for Benedict, and bad news for everyone else).

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