The occupation timer is deliberately capped at five turns.
Why does the Pedia Page for the Legendary culture level claim that it gives 6 turns of unrest on conquest then?
Anyway, while I'm here, have a few more bug reports:
When hovering over the Protestant cross in Academia in the tech tree no tooltip appears. For all other religious symbols in the tech tree a small tooltip tells you that being the first to discover the respective tech founds the religion.
Something is wrong with the Promotion Tree page in the Pedia, the Woodsman line is missing entirely and the Flanking line only starts with Flanking II.
The "Nobles from X family are angry with their inlaws from Y for marrying in a different faith" random event probably shouldn't happen with civs that aren't even supposed to have a nobility in the first place. I have seen it between Canada and America, with both civs being bona-fide liberal republics. I think the event only checks for state religion and no other factors.
And, finally, the Settings tab in the Victory Conditions screen has been missing for several real life years and development versions of DoC, making it a chore to try to figure out your difficulty level or the game speed in the middle of a game.
Edit: Oh wait, there's also some minor interface nuisances:
Yields from (Un)Happiness only seem to be applied one turn late, and the interface isn't at all clear about how it works either.
Air units that are able to bombard defenses should show the percentage in the tooltip also, not just in the pedia.