Zeigarnik Effect
psychwiki.com
psychwiki.com
The actual effect seems to be written in the form of cause (task interruption) and effect (overestimation of time) but then takes a leap to say that the overestimation was due to frustration and failure.
With only two studies, and both showing different traits associated with interruption, it doesn't seem to be a universally accepted correlation.
original article: http://blog.sandglaz.com/zeigarnik-effect-scientific-key-to-...
Try this:
http://www.ft.com/cms/s/2/bbf1f84a-51c2-11e5-8642-453585f2cf...
or this:
http://webcache.googleusercontent.com/search?q=cache:KxM7NvY...
If you see this before reading the article, give it a try.