Yes..I believe that KINDRED has the correct answer for review time-lines...I, myself, am a brand-spankin'-new reviewer...I've done a few reviews, and was slated for a product review for the beginning of the month of December, 2010...
I LOVE doing my reviews; and the few times I've done have been with great excitement...But..ther e was/is a problem..I broke my foot. Yes..I broke the 5th Metatarsal on my poor, lil' footie...It hurt SO BADLY. I couldn't even get out of my own way, much less review the product I was sent.
Sooo...when the admins. sent me an e-mail letting me know I was overdue for the review, I let them know what was going on. Basically, I could NOT get into my bedroom, for privacy (yes, I was stuck out on my living room couch), let alone get to my computer to write the review.
Well, now I have only recently-the last day or so-been able to roam around my house (including my computer room, and bedroom); so, in the next few days I am going to (with much excitement!) give the review item a "go 'round", and start on the review!!
So, all said: In NORMAL circumstances, people should do the review within a couple/few weeks..In OTHER circumstances, the admins. are MORE THAN generous (P.S. THANK YOU!!)!!