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val repeatedReq = PeriodicWorkRequest.Builder(
            MyWorkerClass::class.java,15,TimeUnit.MINUTES).build()
            WorkManager.getInstance(this).enqueue(repeatedReq)
My WorkManager is calling doWork every 3-6 minutes rather than every 15 minutes like I specified in my code. Does anyone know why? Thanks.
As pointed by @Kasim, PeriodicWorkRequest has a minimum interval of 15min. if you want to have a unique instance of your request you should use:
val repeatedReq = PeriodicWorkRequest.Builder(MyWorkerClass::class.java,15,TimeUnit.MINUTES).build()
WorkManager.getInstance(this).enqueueUniquePeriodicWork("YOURUNIQUENAME", ExistingPeriodicWorkPolicy.KEEP, repeatedReq)
ExistingPeriodicWorkPolicy.KEEP: If there is existing pending (uncompleted) work with the same unique name, do nothing. Otherwise, insert the newly-specified work.
ExistingPeriodicWorkPolicy.REPLACE: If there is existing pending (uncompleted) work with the same unique name, cancel and delete it. Then, insert the newly-specified work.
Periodic work has a minimum interval of 15 minutes. 
If it runs every 3-6 minutes, you have many workManagers. You forgot
to cancel the others
        
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