AVA232: How often do you improvise for a service?

This question was sent by David. He writes: So...I keep hearing you and Ausra saying to improvise for service music during communion etc. How often do you improvise for a service? Every week? Once a month? That certainly seems much more doable than learning 27 pieces a month in the beginning... Though once the hymns are all learned, it would reduce to 11 per month to not repeat for 1 year.