hello i have a SO and i think the power reserve is 40 hours? how accurate is that? i seem to be getting significantly less like close to 30 hours. maybe thats normal? ive only left the watch idle a few times, but just this weekend i left it for about 27 hours give or take. i then wore the watch for about 1-2 hours and left it sitting from about 7pm until the next morning. when i went to put it on it had stopped at about 0630. did i maybe not wear it long enough to get a full power reserve? am i using the correct terminology?

i dont have a winder, maybe i should look into one? i wear it pretty much everyday but there will be times when i want to leave it at home.
thanks!