It's very dependent on the job, the company, and the individual.
At my current job for example it was only about 24-48 hours for me, but I also had been working on the same project as an open-source contributor for about 2 years prior to joining the company and we have a rather efficient on-boarding process.
In contrast, i've got friends who didn't get to the point of being truly productive until multiple months into their new job as a result of either a bad on-boarding process or them needing to learn a lot of new things for the job.
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