Think the same. In my case, though it is "Being excited and happy for 4-5 hours a day at work". More than that and my brain is just too tired to enjoy the rest

Think the same. In my case, though it is "Being excited and happy for 4-5 hours a day at work". More than that and my brain is just too tired to enjoy the rest of the day. My schedule is 40h/week, though, but I'm still productive doing half of that.