Don't really know 32HRmag. I've never left it on for more than about 30-45 minutes at a time. It's almost impossible to forget to turn it off because I put it on the barrel in the early morning, then take it off when the light gets good and put it on the plastic tab. Then put it on the barrel again in the late evening and take it off at the end of the hunt.

The one I have is still going strong after two years of intermittent use.