You should engage Users when the events you are interested in assessing are likely to take place, or at times when you hope to help them make positive changes. This variability depends upon your aims. However, given most of the events of interest occur during waking hours, and you don't want to annoy your Mobile Users, you should probably not engage them at times when they are likely to be asleep. With this in mind, remember you need to use military time (24 hour time) when scheduling your notifications. Also, you want to engage your Users when they are likely to be able to answer--so, for instance, not when they are likely to be driving.
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