[Utah-astronomy] Polar Alignment

Has anybody tried the Drift Alignment method to accurately polar align a GEM mount? I found this method at www.darksyimages.com/gpolar.html I had some field rotation in my images last time and so I'm going to try to learn to do a better polar alignment so my stars will be a little more round. My other question is how long does this method take to get an accurate polar alignment? I don't want to spend half the night trying to polar align the mount. Debbie