Board Thread:Speculation House/@comment-27743658-20161126184446/@comment-26397825-20161204063632

I think it's worth noting that the time travel in Pern is not just draining in terms of exhaustion, but it also puts a lot of mental stress on the person - both iterations of them. The 'past self' and the 'future self' both experience a great deal of mental strain that leaves the person irritable. This irritability only grows the longer you are occupying the same time twice as well.

One example an in universe character gives after it was discovered that she spent ten years in the same time twice was like a great weight she didn't even know she was bearing had been lifted, and her personality (which was rude, selfish, cruel and snappish) did practically a 180.