The Answer...?

"...42?"

Why?

Know... SUM Xs Y...

A.E.I.O.U and SUM x Y
1.5.9.15.21 = 51
1+5+9+1+5+2+1 = 24 (reduce 2+4) = 6

and Y = 25th letter (2+5) = 7

7 x 6 = 42 ... and Douglas Adams said he 'made it up'... ha! ;)
AND
6 + 7 = 13 ... but perhaps he only gave us part of it...

42 + 13 = 55 EE

55EE

55.55 IF 'hours' = 3333 'minutes'

=================================================
Pacal : K'inich Janaab Pakal

7413
7431
1347
3147

55.55 'hours'
33 33 'minutes' reading VERTICAL

33.55 IF 'hours' (aka Degree) = 2013 'minutes'

33
55 +
===
88

As days

88 as days = 2112 h(O)urs.

5125 Mayan Long Count minus
2112 (if 'years')
====
3013 minus
2012 'end' year
====
1001 'BEgin' plus....
2112
====
3113 NExt

3333 - 3113 = 220
================================================

3333
=======
2013 -
\\V//
1320 IF 'minutes' = 22 'hours' (22 = V alpha) 11 and 11

220 = 110 + 110
110 = 55 + 55
110 = 55 + 55

================================================

33 hours are 1980 'minutes' and if year...

1980 plus 33 years = 2013
1980 minus 33 years = 1947

33 'hours' = 1980 'minutes'
55 'hours' = 3300 'minutes' +
==========================
88 'hours' = 5280 'minutes' (OM)
Mayan Long count = 5125 'year's

5280 - 5125 = 155

5280
3333 -
======
1947 + 155 = 2102 ~@> 2012

Author: Suz'EcubE

"Digit summing is a key formula in the practice of numerology, and an ancient system to interpret the meaning of numbers in our lives. ..." Wiki.