timer and service module

Hi

I've seen some post that suggests not put a timer on a Service Module.

In the application of Android "Kiosk mode" tutorial a timer is used in the Service Module. ( http://ift.tt/1SYPh5b )

I have to make a "kiosk mode" application, 24 hours run, it is advisable to put a timer of 500 milliseconds in the service module? Or is it better to use the StartServiceAt

regards

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