Back light times on GPS units and runner's watches

Hi - I'll be running the Polar Night half-mara in Tromsø, Norway, on 7th Jan. I wondered if anyone has timed how long a Garmin Forerunner 201 will last if the back light is set to permanently on? If you have the time for another GPS unit or runner's wristwatch, perhaps you could post that also, to make the thread more useful. Thanks.

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