when someone asks you how long is the movie do you say 151 minutes or do you say 2hrs 31mins.?
Like any movie buff, I would say "151 minutes" and display it as "Runtime: 151."
If I were referring to a time duration in a different context, I would say "2 hours and 31 minutes," but would display it as "2 hrs 31 min"
only if there were no caption. Otherwise, it should be "2:31." But don't make me consult my
Chicago Manual of Style.