Trolls have difficulty counting because they’re so thick, so their system of measurement might be less easy to follow…
Trollish measurement:
Despite their inability to quantify distance, trolls are nevertheless very good at judging it. Their small minds cannot cope with the metaphor of describing lengths with numbers. They simply have a good intuitive grasp.
# “Near” corresponds to ~ 20m
# “Not far” corresponds to ~ 1km
# “A fair way” corresponds to ~ 5km
# “Quite far” corresponds to ~ 10km
# “A good walk” corresponds to ~ 30km
# “A long way away” corresponds to ~ 100km
# “As far as the eye can see” varies with visibility
So a city that’s about 150km away would be described as being “A long way away and then a good walk after that” which isn’t too useful till you know how trolls think about distance…
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Systems of measurement might not sound like the most interesting of things, but they can be used to good effect in a role play campaign. There are three main ways I can think of: 1) Adding colour; 2) Culture shock and 3) Archaic systems.