I’ve yet to hear of a field where that’s the case, if you’re doing all of the full load of undergrad and postgrad teaching, admin, committee work, reviewing, reference-writing, editing journals, mentoring and training younger colleagues, grant-writing, conference presenting, sitting on appointments committees, and (last but most important), research and publication. In my field, like many others, it’s very common not to even get a permanent lectureship until early forties because the standards for appointment are now so high. So I’m afraid I just really don’t believe you!
Of course I do/have done the "full load". That's just the basics of an academic job you're describing. We are expected to, you know, work. This is not a hobby.
I'm not sure what you don't believe. I got my first lectureship when I was 28, and have worked very solidly since. Thankfully, with great success - I'm really good at this.
I suggest perhaps getting a life coach to help you with your time management skills, because the things you describe above do not take any normal academic 11 hours a day, including Saturdays and Sundays,