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I often find I spend 20 minutes trying to formulate a good SO question, only to discover the solution just before pressing submit.

Further reading: https://en.wikipedia.org/wiki/Rubber_duck_debugging

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When learning a new and difficult topic I do this a lot. For the topics I have difficulties with it takes 20 minutes to build a workable test case, and perhaps a lot more than 20 lines of code alone.

It's not always that however. Most recently I spent 4 hours debugging socket.io disconnecting before I remembered nefarious DPI/crawling done by the house ISP https://nodpi.org/2010/08/07/talktalk-becomes-stalkstalk/

In that case it can still be beneficial to post the question and answer it yourself. Especially if it benefits other developers as well.

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