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9 Months in a Human's Gestation Period
This is a Ditloid. The answer is 26 Miles in a Marathon. (approximately)
13 M of N = 13 moons of neptune.
568 M in a P = 568 millilitres in a pint.
4 musicians in a quartet
The answer is '39 Inches in a Metre'.
Millimetres in a Yard
15 Men on a Dead Mans Chest
7 Ages of Man (Shakespeare)
60 Minutes in a Degree
65 male age of retirement
metric absolute zero