T.F.
Mine varies according to how busy we are and the time of the month as far as payroll, tax reports, etc.
I probably put in a good 5 hours a day (including Sat/Sun) but not all at the same time, such as 9-2, etc. It is spread out over the day. So I would average about 35 hours a week specifically working on my company at home.
Our business is not s typical 9-5 job because we do have warehousing, we do deal with trucking companies and those things don't always happen on a M-F.
We are hoping to move our home offices to an outside office so that we can keep the work at work because we both tend to work on the company if we ever have any down time.
We love running and owning our own company but it is a lot of work and pressure because you cannot make mistakes or it can cost you thousands of dollars. At the same time, it is very rewarding to see something you build from ground up expand like this has and provide so well.