As sysadmin, 90% of my job is automated. I am available 24/7 if anything goes wrong. But then OTH, I can run errands, watch movies, play video games at work. This is true for almost every sysadmin I know.
My bosses know this, they don't care as long as I am available when needed. Also they prefer that we as sysadmins don't advertise our free time to the rest of company.