Zte Blade A5 User Manual page 20

Duration: Until you turn off means that Do Not
Disturb mode is always on until you turn off it manually.
Touch or to set the duration time for Do Not
Disturb mode. If you choose Ask every time, you
need to choose Until you turn off or the duration time
for Do Not Disturb mode when you turn on Do Not
Disturb mode.
Turn on automatically: Touch an existing rule to set,
or touch Add rule to create new rules.
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