There is no hourly cost when you sit down and do your own income taxes.
Where the government mandates that I spend my time and dollars in minimizing their demands on me, my time is very expensive.
Your time might be of no value, mine is very expensive especially in tasks I don't care to be doing especially when I could be doing something productive and earning instead of handing my hard earned dollars over to uncle.
For that matter, there is no hourly cost to any small business that does their own taxes.
As opposed to earning more, and being profitable instead of hiding income and dodging IRS audits. LOL.
For medium and large scale businesses, tax preparation is a (comparitively) small add-on cost to their own internal tracking and analysis of their own costs and market performance.
10 cents for every tax dollar paid to government is the average "compliance cost", unfortunately "compliance costs" are not the dominant factor in why prices can fall under an NRST. "Compliance costs" are the least element of the full overhead and opportunity losses that are created by the income/payroll tax system.
Denial, is not a river in Egypt my friend. But in your case it just as well be.
If nobody is writing a check to reimburse you, it doesn't count.