There is no general answer to the question how long divorce will take because there are a lot of factors that play a role.
The most important one is if both spouses want to divorce or if one of them doesn't cooperate. Of course it's much quicker when both of them want it. But even if that's the case the procedure can take up to several months. If it's non-consensual it can take more than a year.
In general the spouses have to have lived separately for at least 1 year before the procedure can start. In the case of your soon-to-be wife they are obviously way above that minimum.