Rye Sourdough with Yoghurt

This is a very quick to make rye sourdough (made from rye meal) with 50/50 wheat and rye flour. I made bread with buttermilk and Kefir before but this is my first time yoghurt is used (a substantial amount, almost half of the "liquid" is yoghurt). Since I made this at a week night again I couldn't afford long proofing times; besides the sourdough - which needs to be started the day before - total time for preparation including baking is just under two hours. Most of the rising actually happens while it's baking.