> Generally there is a reasonable limit on the number of billable hours you can have in a week and be productive. I actually haven't found this even when worki

> Generally there is a reasonable limit on the number of billable hours you can have in a week and be productive. I actually haven't found this even when working about 80 hours a week (~60 externally billable). The key is splitting it between 3 things: 1 primary employer; smaller contracts; building my own startup. The variation in work definitely keeps things interesting and productive.