The Central Time Zone includes the states of Alabama, Arkansas, Florida, Illinois, part of Indiana, Iowa, part of Kansas, part of Kentucky, Louisiana, part of Michigan, Minnesota, Mississippi, Missouri, Nebraska, North Dakota, Oklahoma, part of South Dakota, part of Tennessee, most of Texas, and Wisconsin.
(Total non work time) 30 days. Total days available for work 230 days. Next you have to determine your actual billable time. In most settings, the actual billable time will average 6 hours out of every 8, due to cancellations, no shows, or other problems. So: Available time = 230 days =1840 hrs/yr. Billable time/day = 6/8 =1380 hrs/yr.
Mechanics start there and go to around 20-30, in a few cases a little more. In some cities, there are unions that drive shop rates and hourly way up. Mechanics average 30 to 50 billable hours per week. Flat rate techs do not get overtime pay. However, the goal is to bill more hours than you work. We have seen techs bill over 100 hours in a week, although that is very rare. So expect 60k and up for techs, and 20k or so for lube techs (oil changes).