1 pahar (also written prahar / pehar) = 3 hours.

In Jain time-keeping, the full 24 hours are divided into 8 pahar:

• 4 pahar in the daytime
• 4 pahar in the night

So:

• 1 pahar ≈ 3 hours
• 8 pahar × 3 hours = 24 hours

You can read a simple explanation here and here .