Some things I found:
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The time the mission “The Trail of the Conquistador” remain available is the same as if it was a 1h mission, not a 15 min one. Don’t know if is the same for “The Lost Conquistador”. EDIT: I can confirm this is the same for “The Lost Conquistador”. EDIT2: Also “Chasing Jerónimo” remain available as if ti was a 4h, not a 1h mission.
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The drop location of Jack Boon should be generally “Community Event Reward” as it was given in another community Event other than the Stonehenge one. You can see this here.