In office days have less hours worked as I need to drive back and forth and go out to lunch. At home I can take a call at 6:30am, and frequently eat lunch at my home office desk. And can work until 5 or 6pm. No way I will be in the office by 6am and stay until 6pm then drive home
For me going into the office to get on a conference call is a waste of time since most people I work with are at other locations, states, countries.