@genderstudiesformen
It doesn't really matter. Even if it's 3 months, 1 year or 7 years until she gets dissatisfied with the relationship, disrespects you, steps out and cheats, at the end of the day it's temporary.

Just go in knowing it will be good at the beginning and it will only get worse with time. When she reveals herself and get to the point where it is too awful, that's your cue to leave and kick her back to the streets.