When do shops gain their full stock again? 6 hours? 12 hours? 1 day?

Depends on the shop, although most things are around 24 hours (Runes, Broad tip/unfinished, Feathers etc.)

Regardless of quantity, I've always observed a full respawn time of 24 hours.

Well that certainly makes stocking up on runes, bone bolts, and bronze knives rather annoying.

Regardless of quantity, I've always observed a full respawn time of 24 hours.

When I was gathering items for cooking gnome food, I found that bars restock their beers pretty quickly, probably in about an hour or two. The gnome food suppliers restock in like 10 minutes.

Regardless of quantity, I've always observed a full respawn time of 24 hours.

When I was gathering items for cooking gnome food, I found that bars restock their beers pretty quickly, probably in about an hour or two. The gnome food suppliers restock in like 10 minutes.

 

I guess various shops have exceptions then.

 

I buy magic runes from Baba Yaga and the Mage Guild daily. Baba Yaga stocks 300 deaths, while there are 1k deaths at the Mage Guild, yet over a given amount of time, an equal percentage of runes out of the shop's total replenish. This is just one example.

 

But yes, there are exceptions then.

It appears that you're correct zaaps as you are bladewing. Too bad bone bolts and bronze knives aren't a part of the exception.