Canon EOS R6 Mark II Mirrorless Camera with 24-105mm f/4-7.1 Lens - Manual (Page 322)

Metering Timer
You can set how long the metering timer runs (which determines the duration of exposure
value display/AE lock) after it is triggered by an action such as pressing the shutter button
halfway.
1.
Select [ : Metering timer].
2.
Set a time option.
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