You don't need to soak that long. 5-10 minutes should do it. Longer probably won't hurt, but isn't necessary (at least with Physan 20) Be sure to disinfect any blades you use before and after cutting the rotted tissue and roots away. Good luck.
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Ross
http://orchids-ross.blogspot.com/
I don't do most Dendros or large, "floofy orchids". For me it's minis (like Angraecoides), Masdies, Paphs, and others that crept in somewhere along the line. See my orchid list for complete collection (usually not current.)
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