I found a horse trail near my home in an area where I like to go walking. So today I grabbed a plastic bag and went for a walk. I now have some sun-dried horse manure that I hope to feed to my worms. But I have no way of knowing if the generous contributor to my vermiculture efforts has been recently de-wormed.
I plan to put the manure in a bucket of some sort, add some water to re-hydrate the manure then toss in a few worms to see if they survive.
How long should the worms survive in the manure before I declare it edible?