I have a church and spend some chunk of my active off-hours doing various activities there - maybe 10 hours a month. If I were to retire, I imagine that time wo

I have a church and spend some chunk of my active off-hours doing various activities there - maybe 10 hours a month. If I were to retire, I imagine that time would double or triple. That's how I'd recommend viewing non-profit work in advance of retirement. Is there a non-profit you're spending effort on now? Spend more effort there. If not, it's probably a good idea to examine your values and find some organizations that advance them and start helping out.