I am also not writing code - which I think people just assume is the case. My role as founder is super varied, so in any given day I will do a meeting or two with investors, calls with the CTO, hangout meetings, design sessions, "brainstorming" or whatever you want to call a creative process, recruiting, reading industry news, reviewing financial statements, calls with customers, customer support emails, building presentations etc... I spread this out from about 830 AM to 1 AM with most of the work from 830AM - 5PM Break for dinner and family time from 5 - 830/9 then do some of the lighter work again from 9PM - 1 AM.
That works for me and my family. I have worked in much more stressful environments and can tell you for a fact that there is no dip in productivity - if anything, working less makes me antsy.