Timing in low power mode

It seems that I can’t use millis() to establish elapsed time when using sleep mode(LowPower_Handler().)
Which is fair enough, but is there a simple way to find the elapsed time between two interrupts when using low power mode? I can use a timer, I suppose, but to get even one second granularity would, I imagine, add a fair amount of power consumption.

This seems to count even in low power mode

TimerTime_t curTime = TimerGetCurrentTime( );

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Thanks. That works for me.