My numbers come from 2016 before I sold off the majority of my business and became a FT CFP advisor. I still have about 100 tax clients today.
Tax Season 55 hours.
Off season 25 to 30 hours.
4-6 weeks of vacation
At age 50, I NEVER worked a Friday from 4/16 to 12/31.
I would say , with the above, my income was in the top 10 percent of sole practitioners... at least I think so. (We were a 2 person form for the last 12 years.