Related: Repository Repository
It would be cool if we had a repository for the Outside/calibrated view for how long commonplace tasks take. This way we can help one another get around the planning fallacy to a certain degree. Nothing beats direct measurement, but we can possibly save energy if enough evidence comes in to make us suspect that the time a certain task takes doesn't vary.
I could update this thread as more contribute. Depending on the variety of tasks, categories could be created and an index can be compiled. Observe.
Washing Dishes: 30 mins
Doing Laundry: 1 hour including drying
Average LessWrong Post: 3 minutes
"Mysterious Answers to Mysterious Questions": 4 hours
... and so on.