It says rancher, not farmer. Not that they don't have 7 day work, but there is a difference.  How much time there is available depends very much on what he raises. 
Who did the work when they had their honeymoon? 
This all should have been worked through before the wedding.  If she cannot get involved enough to either spend time with him working, or do enough of the chores that he can take regular breaks with her, she should leave. He was like that before and it only goes to show that age does not always bring wisdom, especially in one's love life.