We dated for a couple of months short of 2 years when he "officially" proposed...but he started asking me to "be his future wife" almost 6 months before we started dating. He still asks me to marry him every day.
Dated 2.5 years and have been engaged for 5 months. By the time we get married, we'll have been together a little over 4 years. But I've known since about two minutes into dating him that I wanted to marry him. Lol.
We'll be together for 3 years at our marriage--dated for 2 years before. We're also 39 & 42 so, I wasn't going to wait for my boobs to droop--or any other gravity catastrophes before I can look as hot as possible in my wed pics.