Why you shouldn't say "I love you" too soon
In my view, you can't really love a person that early in the game. You're merely getting to know each other at this juncture.
Six months to a year makes more sense. At this point, you likely have a better sense as to the person's flaws, how strong your chemistry is, and whether the relationship is built to survive the honeymoon stage.
If the "l" word is thrown around prematurely, it could signal to the other person that you have an ulterior motive in mind, whether it's to get in their pants or simply have someone around following a tough breakup.
Telling someone you love them is a huge thing -- probably the most significant event in a relationship after being proposed to.
Don't rush into it. Don't tell someone you love them until you feel you're ready.