On one thing only no more than 15m. Multi tasking I can stay indefinitely but degrading in overall performance.

Optimal? 45m + 15m break

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I feel very much the same way. I find it difficult to stay highly concentrated for longer than 45 or 60 minutes. Sometimes with complex questions, however, only 20-30 minutes. I like to leave the screen during the break. Walk a little. Drinking water is also good.

Absolutely. Walk, breathe, drink, stretch your legs away from the screen. Way less tired at the end of the day, much better results at work, whatever the job is.