Seiko S833 Instructions Manual page 120

・How to set the time before the Power Save function is activated
Use the Time/Calendar Setting display to select the time before the Power
Save function is activated or turn it off.
The time before activation can be selected from 30 minutes, 1 hour, 2 hours,
2
and 4 hours.
The default setting is 30 minutes.
Refer to "How to set Power Save function" on P. 131.
※The Power Save function can also be set in the smartphone application.
In that case, after the setting procedure is completed, synchronize the watch
with the application manually for the setting to take effect on the watch.
※In the following cases, neither the Power Save nor the Sleep function will not
be activated.
・When the amount of power reserve is sufficient (
・While the altitude is being recorded in the Altimeter mode including the
case where the Field Mode REC function is turned on; and
・While the stopwatch is measuring.
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