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My humble and educated guess is, there are many films that are under one hour

as well as feature length.  Simply stating minutes only is one of the ways

the film industry tries to keep rules based on consistency.  It's also easier

for editors, projectionists, etc. to guage a films length in terms of feet

and so forth by knowing total minutes.

 

i.e. a film that runs 129 minutes is 7740 seconds.  Film is projected at 24

frames a second, 16 frames a foot (35 mm) so this film would be 11,610 feet

long.

 

Of course, I am only guessing.

-Joe