I had a Roman campaign in 0.74 last until around the 70s BC or later (don't remember). I only remember this because it was during the time when the reforms were tied to a specific date.

There were plenty of CTDs, but I could get around most of the reproducable ones by "cheating," eg the reinforcement CTD I avoided by tying the ? button on the battle announcement scroll to the command "auto_win defender" in the script