I’ve done this in crunch periods but it’s obviously unsustainable. I recently sustained that pattern for two weeks to deliver a big chunk of work to a deadline

I’ve done this in crunch periods but it’s obviously unsustainable. I recently sustained that pattern for two weeks to deliver a big chunk of work to a deadline. Then I took a holiday. As a younger person I routinely put in 36h of continuous work. Can’t do that no more. Some of us actually prefer to sprint then rest.