Black walnut shavings- how long for toxin to degrade (or fence it off in perpetuity??)

We took a black walnut tree down due to derecho damage, and it’s impossible to remove all shavings / chips from the ground. Anyone have information on how that toxicity behaves over time / exposure to snow/rain/oxidation? Trying to decide whether I can hot-tape it off (if it’s a 1-3 year timeline) or am I looking at fairly permanent fence

Unless you have the horses in a small paddock that forces the horses to stand on the saw cuttings or have used a chipper making piles of chips, you should have no problems. I took down a large black walnut tree in a corner of their pasture. The wood went to the woodshed for heating. Leaves dried up and blew away. They used to stand under the tree, where I cut up the walnut. The saw cuttings disappeared in a few weeks. You might use a leaf blower to scatter any piles of cuttings.

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This^^^^^