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Initially if there is a large drift I may only let it run for 15-20 sec. As your polar alignment accuracy gets closer and closer I'll let it run for longer but rarely longer than a min or two. If you find you get a drift and then it settles out reselect the start or hit the reset icon in the drift explorer to zero it a again. As I'm sure you're aware you are aiming for the pink graph to sit on the zero line (+/- seeing effects), and the pink Dec drift readout to read 0. I normally settle for anything less that 1 arcsec drift. A bit of dec drift is ok. It keeps all the dec adjustments during autoguiding in one direction and helps to eliminate the need for backlash compensation.
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