Sounds like someone has a pop culture understanding of history - that whole "right of the first night" does not show up in any actual medieval sources, only stuff people wrote hundreds of years later (ie, bullshit). And if you were accused of being a witch, going to the Church was the best option; they regarded most witchcraft accusations as peasant superstition. You were more likely to get convicted of witchcraft by a secular court.
As for working hours, during planting & harvest times the serfs would be working their asses off, sunrise to sunset, and then maybe a bit more. During the rest of the year, things were a lot more sedate, with much less work to do & lots of church holidays.