...And while those two could be completely different books on the same subject, it does sound a bit unlikely that two vessels of the same name would have a Chicago criminal history freak aboard. Unless we're talking about a continuation of the Boomer culture, so that the second
Horizon is in fact the direct replacement of the first one, and the books move from one ship to another.
A completely separate
Horizon, perhaps a Starfleet vessel, would make little sense in this respect. OTOH, we might want to make the ship Starfleet because the Non-Interference Directive is virtually never raised as a concern with civilian ships. Dropout Merrick in "Bread and Circuses" is essentially the sole exception. And the charges Kirk makes against him might be unrelated to the Prime Directive or the Non-Interference Directive, as Kirk only speaks generally about "interfering in the affairs of others".
Or more importantly, TOS and TNG didn't use the same warp speed chart
Quite regardless of warp speed charts, the absolute speed of 1000 ly per 10 hours is a rare achievement in all the shows - possible but reputedly devastating to the ship, and never sustained beyond said dozen hours.
12 hour run over 1000 ly, cool down for 12 hours, repeat again
I suppose the concept would be more like "12 hour run over 1000 ly, phone for a towship, buy new starship, another 12 hour run over 1000 ly, phone for a towship again, buy new starship".
Timo Saloniemi