A league is 1,500 × 5 × 12 = 90,000 inches, so the trip takes 90,000 days. Alcuin counted it in 365-day years: 246 years and 210 days. Lunch will be cold.
A swallow invites a snail to lunch, one league away. The snail can manage one inch a day. If a league is 1,500 paces and a pace is 5 feet, how long does it take the snail to get there?
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Turn the league into inches first.
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90,000 days, or 246 years and 210 days
Source: Alcuin of York, Propositiones ad Acuendos Juvenes, No. 1, c. 800