Canon EOS 5D - Manual (Page 39)

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You can set the auto power-off time for the camera to turn off
automatically after a set time of idle operation. If you do not want the
camera to turn off automatically, set this to [Off]. After the power turns
off, you can turn on the camera again by pressing the shutter button or
other button.
1
Select [Auto power off].
Turn the <5> dial to select [c Auto
power off], then press <0>.
2
Set the desired time.
Turn the <5> dial to select the
desired time, then press <0>.
3 Set the power-off time/Auto power off
After auto power off, you can turn on the camera again with any of the
following buttons: Shutter button, button, and
button. Pressing the <9>, , or button will not turn on the
camera.
If auto power off is [OFF], and the LCD monitor is left on, the LCD
monitor will turn off after 30 min.