Most women get bored after a few years. That's when you dump them
Yup, trade the gal in for a new model.
I'm teetering on dumping my 3 year GF, but she actually has grown on me a bit. I haven't had a relationship last more than 3 years since high school.
Having a woman who will literally do anything for you, no questions asked, is a blessing.
3-4 months is the best, to see what they bring to the table. By 6 months you know it they are worth a shit, as the new car smell has worn off and you know how stupid they really are.