I try to use a toy as long as possible before actually starting to write the review. I DO usually write it in Word, but it's hard to do with a DR, because you have to use the Extended Template, and then you have to take your review apart to fit it in the right parts.
I often don't catch mistakes until I have posted it, so I use the Edit function several times, but over a period of several minutes, not days.
I nearly always use a product long enough before writing a review to know if it's defective or not. It does kind of bug me when someone obviously only used the product once, that morning and then wrote a review on it. I think you need to get to know a product, its idiosyncrasies, its benefits and as much about it as you can before you write a review. You can tell these reviews because they are usually lacking in detail, often tell you what they didn't get around to doing with the toy yet, but will eventually (USE IT, in as many ways as you think you will, then write the review!) and often have a Follow Up 2 days after the main review telling us about how the toy sucked (after loving it with one use) or how it broke on the second use.
It isn't a race. I'd rather take my time and get the details as well done as possible. If you have to do a Follow Up with complaints less than a month after you've written the main review, you probably wrote your review after too few uses. This doesn't apply to single use products, of course.
Mileage and all that.