Pretty much what Maria says. DH works FT, I've been a SAHM for a dozen years.
I met someone recently who demanded (yes, demanded) to know what on earth I do all day!!! Surely I'm bored? Well no, I don't have time to be bored. Because DH works (often away all week), my "job" is our home and DC. I do all the gardening, house maintenance (not very good but I am keen), housework, shopping, ironing, everything DC related.
There will be plenty of people that assume that you will have endless coffees, be a "lady who lunches", that sort of thing. The reality, once you get into a routine, is that no two days are ever the same because there's always something that needs doing.
I do have hobbies but rarely get time to enjoy them. However doing everything during the week does mean that my DH doesn't have to help with many jobs during the weekend and we get family time. It works for us.