I don't think a turn based game Will last for and excessive amount of time.
A normale game of ti last 5-6 round right?
In each round you May do:
Some tactical action, but the 80-85% of the time you don't Attack anyone so the turn Is fast
One strategical action , and this could be a slow action because you have tò wait the others player for the secondary ability of the strategica card
And the componenti actions, that are quite rare and usually doesn't involve other players
Then there Is the council phase, but only After Simeone take mercatol Rex
I think that a TI turn based game Will last 25-30 days