Canon EOS 80D - Manual (Page 206)

F : Bulb Exposures
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3
Set the desired exposure time.
 Select the hour, minute, or second.
 Press <0> so <r> is displayed.
 Set the desired number, then press
<0>. (Returns to <s>.)
4
Select [OK].
 The set time will be displayed on the
menu screen.
 When you exit the menu, <p>
will be displayed on the LCD panel.
5
Take the picture.
 Press the shutter button completely,
and the bulb exposure will start and
continue until the set time elapses.
 To cancel the timer setting, set
[Disable] in step 2.
Bulb timer
Elapsed exposure time
 If you press the shutter button completely and then let go while the bulb
timer is operating, the bulb exposure will stop.
 Doing any of the following will cancel the bulb timer (reverts to
[Disable]): Set the power switch to <2>, switch to movie shooting, or
change to a shooting mode other than <F>.