When do you prefer to write a follow-up review?

With all the assignments I try to respect this 2-3 months requirement. With the other items I happen to review - as soon as I have something new and important to add, but can't edit my original review anymore.

Sometimes we violate the 2-3 month rule if there's additional information to be added, or if its a product that requires a little more...um..."testing". . to get the full review.

I didn't vote since I don't write reviews, but as a reader I prefer follow ups that are 4-6 months later. If the follow up is too soon I wonder if the reviewer is still in a honeymoon phase. I would also like to see another way to update a review if the reviewer learns something new about the toy, or a way to indicate when the toy reaches the end of its usefullness.

I usually like to wait a few months. I thinks it good to give yourself time to decide if your initial impression still holds true. Plus during that time I've typically tried other toys so my perspective oftentimes has shifted to some degree.
I've noticed the same thing that you have with people doing a follow up review days after doing the original, and I tend to dismiss them as people just getting points and I don't factor them into my purchasing decision.

Sometimes I'll do 2 weeks after, especially if it is a product I didn't like and know I still don't like it. Otherwise, I try to give it the 2-3 months.

Usually a month or two later, but I think it depends on the item... If it were a single-use item, or can only be used a couple times, the follow up would be sooner.

I try to wait 2 to 3 months before writing a follow up, unless it is a toy we have thrown out.

I can count on one hand the number of followup reviews I've done before I got the 2 month reminder email. There was a box of pasta that was a one time use thing, so I did a followup a week or two after the initial review with some recipes (it was one of my first reviews). And there were these pheromone bracelets that sucked and I did a follow up on those within a few weeks as well. Everything else I just wait until I have something else to say about it. Some things I haven't so there haven't been followups on them.

I always wait at least 2 months, unless something has changed since the review that I need to let people know about. Something like, the toy broke during normal use or the material has seriously degraded.

2-3 months

I wait about one month to six weeks before I think about writing a review for a new toy here at EF (on my blog? that is a different story and depending on the toy itself). And then it could take up to six months to a year before I sit down and actually write the review here at EF. The few times I have written a follow up review the same day, or under the two month period, I do mention the length of time I've had the toy.

As Gracie said, if I read a review that was written under six weeks after the review, I question if the author of the review is still in the honeymoon phase, unless otherwise stated in the follow up review that they have had the toy for a prolong period of time.