But if you are working on a signature campaign then try to make your post time interval long so that it can help your campaign and the banner promoted to be visible on different time of the day.
People are really doing that??
I don't think anyone does that except the person who mentioned it. I didn't check his post pattern though.
Imho, that doesn't make much sense to me and I don't think that it even work the way you think or helps the campaign you are part of. Instead trying to time your answers and spread it over longer period of time you should focus on the quality of your posts and everything else is less important. That of course doesn't mean that you should write 5 posts in 10 minutes, but if you are actually putting some effort in your posts you won't be able to that anyway.
We should understand what the campaigns expect from the participants. If they want something special from us, they would have mentioned that on the signature campaign thread. For example, they ask to write a minimum x number of posts in x board. Write a review about their service and more. But I don't think any campaign asks their users to give some time when their participants publish posts.
We are good as long as we are making an effort in our posts and do not spam for the sake of signature requirements. Sometimes I could write posts with ten minute gap. But, sometimes it takes me half hour to find out a thread where I could write my thoughts. It's not something we can fix the time.