Around 30 hours' usage here this month, with the thermostat set to 16.5C when I'm here and 14C when I'm out.
It's presently 17.5, so the heating won't be on for a while.
(When my dad was still around, the themostat was set to 21 or 22. Maybe I'll feel the chill as well when I get to my mid-60s, assuuming I live that long!)