It can take MONTHS of water soaking, really depends on how bad it is to start with (talking RCA type bonding).
I have one that has been out out side for well over a year, maybe 2, its in a foam packing case (the kind it was sold in as a rebuild). I have a funnel that catches water and drains into the face area. the pins and anode are covered in grease to prevent corrosion. I dug out some of the bad plastic to help trap the water.
I was tempted to just bury the face in the dirt (with a soft towel to protect the face) and let the microbes have a shot at it.
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