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Re:Converting 600k lines of code to TypeScript in 72 hours by edpichler on Friday November 17, 2017 @05:02AM (#15720652)
In general, any Hackaton happen on this way, long hours concentrated on a challenge.
Re:Converting 600k lines of code to TypeScript in 72 hours by pjmlp on Friday November 17, 2017 @08:25AM (#15721748)
Not in countries where it is forbidden by law to work more than 10 hours a day, unless a specific work permit has been signed off for that specific purpose.

Of course, one can do them illegally and be subject to the possible consequences.