* Meetings
* Mentoring
* Answering random questions
* Continuing education (Hey, Spring 6.0 was just released, what's in that?)
* Support (and being available for support)
Those can easily fill in a lot of the 'void'.I can point to 5h/week that are standing 'meetings' where it is often 'me helping out someone with a git or jira or GitHub issue' and it is that time that is designated each day (to try to avoid having the 'answering random questions' become too disruptive).
I am certainly not '40h/w, butt in seat, head down coding' and even though I may be only "productive" 10-20h/week, I'm certainly busy with work stuff to fill up the rest of my day. It's never "do an hour or two of work in the morning and day dream for the remaining six hours."