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.
Chores
Washing Dishes: 30 mins
Doing Laundry: 1 hour including drying
Rationality
Average LessWrong Post: 3 minutes
"Mysterious Answers to Mysterious Questions": 4 hours
Misc.
...: ...
... and so on.
I'd suggest adding separate columns for actual WORK TIME versus total ELAPSED TIME after email turnaround, task switching, sleep, etc.
Prepare kettle of chili from scratch: 40 min work time, 3 hr elapsed time
Read a 350-page novel: 6 hr (work & elapsed)
Read 690 pages of economic history excluding references: 52 hrs (work time), 3 months (elapsed)
Read a 350-page novel in your 2nd language: 9 hrs (work & elapsed)