It depends on the month, and what items are out there for free review. Sometimes I'm not loving the stuff that's out there, some months I am. When I first began reviewing I couldn't imagine not ordering the free review item the day I could, but now I'm averaging about one every other month. I've got so many other things to review.
I wait until there's something I'm interested in. So sometimes it's the day I'm eligible and other times (like now) it'll be over a month.
This. It really depends on if there is something I have interest for. Like Kira, if there is something so fabulous that I think I'd really enjoy it'll be the same day.... but this is not always the case.
Sometimes I wait. I actually really like the free shipping that comes with assignments. So if something is out of stock that I want to buy I will wait. That way I get a free assignment and free shipping