Without testing the vial ( not economical) you won't really know.I had an accident today, after pinning BPC forgot to put it back in the Fridge to find out only at night. It was about 17 hours at about 22 degrees, no sun or light. I couldn´t find any info about this case. I assumed the vial is "lost" but maybe someone knows the correct answer.
Thanks!
Personally , I would use the remainder as a vial gets used very quickly and think nothing more about it.