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21 kilometres in heavy terrain? A while.
I find myself able to hold a steady 4 miles per hour, which would be around 6.4 kilometres, on level ground.
So at that pace, it'd be about 3.5-4 hours.
Add in the 'heavy terrain' and you'd be looking at about 4.3 kilometres an hour, assuming you could keep 6.4 going for an extended period.
So about 5-6 hours.
What else can I help you with?
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