I figured to update this topic with my current experience in the past two weeks of this post response @ 9/13/2018 with 5 recent idoc keeps and castles. As I have been observing these properties fall. The final moment when they become IDOC, I recorded the timer lately as between 15-20 hours. Viewing other sources before, it seems that it can be random but the larger castles and keeps are falling on this time during my participation in OSI shards. The timer seems to be around this time range after the process of the decay phases within 5-6 days. If someone wants to join again and clarify the current data report, feel free to. Just wanted to contribute some activity while supporting.
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