I've only been with my FI for a year and when we get married next May, we'll have been together for a total of two years (we've known each other for a while, but relationship wise it's only been a year). To a lot of people, that doesn't seem like enough time to get to know one another but there is no doubt in my mind that FI is who I'm meant to be with! I don't really believe that the length you've been together is any indicitation on how strong your relationship is; before FI, I was in a 3.5 year relationship that was no where near this deep and marraige was the last thing on my mind then! But my FI is my perfect match.. we balance each other completely and I admire him in so many ways. I honestly know that he's the one for me today, tomorrow, and will still be the one for me ten years from now.

Gushing aside, here's the real questions:
How long have you and your FI been together? How long into your relationship did you know he/she was the one?