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Long life: Traditional road flares burnoutin 15 minutes. The Flameless Flare LED safetyflarewill run for 250 hours continuously. The LED bulbnever needsreplacing. Simply replace the AAAbatteries.
Also question is, how long do road flares last?
15 to 30 minutes
Consequently, how long does a flare last in the air?
Handheld flares Flares like this are typically visible uptoabout 5km (3 miles) away for anything from 30 seconds toseveralminutes. Since smoke doesn't generate light, smokeflaresare useful only in daylight.
Hold the flare as far away from yourbodyand face as possible. Also, remember to holdtheflare by the middle, with your hand away from the endyouwill be lighting.