how long would a standard Medieval torch burn?

If a person need to calculate time by how long a standar Medieval style torch burned how long would be a good guestimate

till it went out...
jtobako8 years ago
What is a 'standard' medieval torch? The chunk of wood a peasant or solder grabs out of the fire to see what's in the night? The giant candle used in processions? An oil lamp?