That was also my first thought, I feel 10 hours (or even 9 hours) is extremely long. Being laser focused for 9 hours is extremely hard to do on the long run. As

That was also my first thought, I feel 10 hours (or even 9 hours) is extremely long. Being laser focused for 9 hours is extremely hard to do on the long run. As others said, you need to find your own schedule but don't aim for 10 hours first thing, go slow