@jerry Having recently been read Max Tegmark's 2014 "Our Mathematical Universe", I strongly recommend it - not just for Max's fascinating perspective on the larger question, but for getting the reader (listener) to the point to be able to understand it. Your library system probably has a few copies.

Fifteen hours at 3× is "only" five hours.

From the frame of reference of massless particles such as the photon, there is no time. They experience every moment from the beginning to the end of their universe simultaneously. Consequently they can listen to audiobooks at any playback speed.

Concerning 137, see https://www.youtube.com/watch?v=RCSSgxV9qNw (and all the other videos on this channel).

#SpeedOfLight #FineStructureConstant #SommerfeldConstant #137 #Multiverse #MaxTegmark #Physics