"Light bulb heat is not a bulb life factor until the bulb glass melts."
Details?

"Suspect high voltage only if other bulbs in the house burn out too
fast as
well. "
I've seen some funky stuff, so my realm of possibilities include
someone connecting different bulbs in the same fixture to different
sources, attempts to wire up a bulb as a nightlight gone horribly
wrong, and other things that would be amusing if they weren't done so
horrendously wrong.

Dave