The big topic today at lunch (chicken flautas for me) was how long it takes to realize when you are with "The One." The answers varied but the guys wait until they found out if a woman will do certain things while the women wanted certain traits.
How long though? None of us believed in love at first sight. I feel that is more of lust at first sight because you have no idea how they handle conflict, temptation, moods, finances, etc...You know very quickly if you "click" with someone but the majority agreed that it was somewhere in the 4-6 month range. But, then even when couples know they aren't compatible, they stay together.
After the honeymoon stage, when you have to rely on communication and conflict resolution is when you really find out if you will end up staying for good.