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I think the answer depends on the required power budget. But the application note "Measuring CC13xx and CC26xx current consumption" from the product web page is covering some aspects of low-power modes and its wake-up mechanism. It also focuses on power measurement setup. So maybe this is a good starting point for your customer.
there is also a power calculation tool available, which might help to estimate the current consumption and battery life-time.http://www.ti.com/tool/BT-POWER-CALC
