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Yeah haha, marathon hangouts!

Thing is though, keeping a time limit enables us to keep the flow of discussion going. Aiming for 2hrs would be ideal.

Yes, definitely. I think a time limit is good and we could end the hangout with open floor, taking more questions and/or discussing more details about things that didn't fit the time limit. The open floor could also be just something that isn't in the hangout recording to.