i'm a freelancer, working around 8-10 hrs a day with small pauses. however i'm taking at least 30% of the year off, cannot be productive 11 months in a row. l

i'm a freelancer, working around 8-10 hrs a day with small pauses. however i'm taking at least 30% of the year off, cannot be productive 11 months in a row. lately i've found out that working sharply less hrs/day and taking less vacation produces more quality and longer lasting knowledge in my head. but my biggest concern is the i/o rate: how much time one takes input (learning, reading, networking) and produces output (code, results, blog posts)