Ya, I am almost 100% sure that LDoN was instanced. I did quite a few LDoNs after it first came out and I never remember having to wait even though tons of people were going in all of the time. I think they only had multiple versions of the zones so that there would be more variety so it didn't get quite as boring doing them over and over and over again.
I think PoTimeB was instanced too, at least for a while. But then I think they changed PoTimeB to just work as an event that was reset after X amount of time.
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