Hmm i got to 15th 50 in 9d 4h so:
24 x 9 = 216 + 4 = 220 hours played
220 divide by 15 (Prestiges) = 14.66 hours
so it takes me a little bit over 14 hours and half hours to prestige
PRETTY DARN GOOD! considering I play TDM!
Btw I only got a C in my maths so I not Einstein

even though he was a scientist