At this time the blood moon variance feature is not really working. It has been reported to the game developers.
What should happen is if you were to set blood moon days to 10 and variance to 5 then a blood moon day could be anywhere between 5 days and 15 days but it seems to stick at or very near to 10.
Looking for a game server host known for brilliant 24/7 customer support and quality hardware?
Try a Pingperfect 7 Days to Die server today! https://pingperfect.com/gameservers/7-days-to-die-server-hosting-rental
