Indeed a 10 hour work week would be incredible for pretty much everyone is it can be achieved. I think the main point regarding time usage is to do the most work with the least amount of time even if that means delegating or hiring employees to do the work for you. Obviously this means you will have added responsibilities in terms of managing your employees, and being someone else's boss obviously isn't an easy, overnight task. But reducing workload while maintaining a very comfortable lifestyle is possible.

mini retirements are awesome, and I think they are actually essential to remaining sane!