Yup I was once a street musician with my friend Jake, we did 20+ hours per week of "busking" each week but sadly like you said, because we were too focused on **quantity** of hours, we did not earn a good amount of money *per* hour and had to give up. 

In retrospect more focus on quality (in this case - selling more CDs and merch, better social media presence, more actual gigs) would have been better than cramming in so many hours in those freezing cold Boston subway stations playing Toto's Africa over and over lol

*I bless the rains down in Aaaaaaafrica*