What sort of business?

[Bob]

I can invest $300k to $400k of my money into a business. If you were in my shoes, what type of business would you pick? I am thinking of perhaps a car repair franchise. Note that due to my health, I can only put in about 30 hours / week into this business on average. I retired from a professional job that I loved but had me working 60 ~ 80 hour weeks. I think I have the basic business / legal background to be a small business owner. My health was not able to do that. I am only 50 years old. I do have other income / investments.

Thanks for your thoughts and tell me if you are or have been a business owner.