I respect your way of revieiwng krislynn.  If I were to review a product of my husbands or my friends, it's usually because I do have quite a bit of experience with it.  I've driven my husbands car about a dozen times, and been it in everyday.  Haven't reviewed it but I feel that I could when I'm in the mood.  Husband's are different though, I guess, because we usually know their products almost as well as they do :) 

I don't have a timeline for how long I need to use something though.  Most the time my opinion doesn't change much from the first use on things like soap, for example, but if it's something that I need to learn before using (like a camera) then I will use it a lot more before reviewing.