Originally posted by Pervy:

I take it you have never played minecraft?
Yes if you are too far away the chunk is not loaded, and time does not pass, goes for valheim and goes for minecraft. Thats why i dont make farms else where, and instead make a pen at my base.

You are right, I have not played Minecraft. It's good to know. I'm going to have to turn my boar farm into Dogpatch.

When you enter a chunk, Valheim could calculate what mobs have been plausibly doing in your absence. Most of the time, they'll just have wandered off. Boars with plenty of food should have bred. The food should be gone. Mobs that were in hot pursuit when you went through a portal should have a chance of destroying the portal before they wander off.