My sense has been that a boar hunt can lead a hunting party far afield. So at least a mile, but no more than 10 miles from the home site. However, the way we've been writing, it has been closer to around a mile.
I don't think the Elves would find it in their culture to throw an fellow Elf's body over a horse; they'd put together some kind of wooden bed that could be dragged between two horses at a slow pace, "in state", as it were.
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