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No drift in a 5-10 minutes is a long wait. I do it until there is no drift (or extremely minor) for a 1-2 minute period. If you are just live videocamera viewing then the drift method will just help you with having to make less corrections to keep the viewed object centred (if any corrections are needed at all). When I use my GEM for visual I just plong it on the ground using a compass and the basic mounts declination setting and don't even worry about the minor drift.
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