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Do you want extra time per a day? yes!!!‘additional timer' gives you!Do experience the another tick speed!“h25” mode : You get extra one hour a day.“h23” mode : You lose one hour a day.and…“additional timer” mode : You get additional time you want!! By compressing the time from the Start to the End, to get the Additional.(enter the Start time, the End time, and the Additional time.)You can check the current progress on Apple Watch.Screen lock will be suppressed during display (iPhone).Let's try out !!