How long does it take for the stone exposure meter?

The world exposure meter takes 60 hours. The exposure meter itself consumes little power, and a battery can be used for 60 hours at room temperature. An exposure meter is an instrument used to measure the intensity of light. In photography, the exposure meter is used to determine the appropriate exposure time. When the film sensitivity and shutter speed are known, the exposure meter gives the aperture value to obtain the best exposure.