What affects the Brightbug's duration?

I have found that in some circumstances, when I use a Brightbug, the effect may last several minutes, but in other circumstances, it might only last 30 seconds.

Does anyone know what might affect the Brightbug effect's duration?

dark-souls-2

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What affects the Brightbug's duration? - Child Holding Hand of Another Person

What affects the Brightbug's duration? - Man in Gray Shirt Holding Baby in White Onesie

What affects the Brightbug's duration? - Man Carrying his Son on his Shoulders

How long does bright bug last?

Effects last for two minutes. Brightbugs cannot be used while a phantom or shade is present.

Can you farm Brightbugs?

Can be farmed with Bonfire ascetics, though this requires defeating the area boss again.

Who sells bright bugs in ds2?

Availability

Three sold by Merchant Hag Melentia. ...
One found in Belfry Luna down in the dog filled dead-end alley where Vorgol the Sinner invades, from the bonfire after the boss. ( ...
One found in Aldia's Keep in a metal chest near the mirrors in the great hall. ( ...
Two found in the Cave of the Dead, on a corpse.

Dark Souls II - GLITCH INSETTO LUMINOSO [come attivare il Brightbug Glitch]

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