6 days ? Lol nope u just are unlucky

They spawn in a spawn spot of 64mx64m ( like any biome mob ) and if u kill these loxes takes 1000s ( 1/2 game day ) to respawn but have a 5% to spawn when u re-enter in that spot

https://www.reddit.com/r/valheim/comments/n3pn4g/enemy_spawning_explained/