12 Men in the Dirty Dozen (good film)
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.
12 Lines on the Underground
4 musicians in a quartet
The answer is '39 Inches in a Metre'.
Millimetres in a Yard
It is: DD = M and M*C = (C) which means 1,000*100 = 100,000
15 Men on a Dead Mans Chest
12 seconds on the buzzer
10 Centuries in a Millenium
65 male age of retirement