Guard Hartt (Butcherblock) not on 6 minute timer

[Ropethunder]

This guard is outside and is on a 20 minute timer. I believe he should be on a 6 minute timer? :confused:

[Telin]

Do you have any sources? I could only find 21.5 minute spawn timers mentioned in comments. We have Butcher guards varying between 18 and 24 minutes.