it's not entitlement. you only have so much energy per day. it also has been shown that the longer you work the lower your productivity gets. two full time jobs would be at least 70 hours per week, and even if you work 6 days a week, then that's almost 12 hours per day, leaving you with 12 hours for sleep and the rest of your life. that's barely manageable. i am half as productive when i am tired. you can do that if the work does not require a lot of concentration or energy and is low stakes. but not as a software developer.