https://pilotworkshop.com/tips/hypoxia-and-oxygen-use/
The FARs for Part 91 pilots only require that supplemental oxygen be used after 30 minutes of exposure to altitudes between 12,500 and 14,000 feet. But consider that pilots for hire (Part 135 and 121) are required to use oxygen above 10,000 feet. I would favor the conservative approach that professional pilots are required to adhere to and use supplemental oxygen anytime above 10,000 feet.
https://www.aopa.org/asf/asfquiz/quizzes.cfm?SA=Quizzes&QuizId=57
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