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Autoguiding takes care of all errors in tracking... but it is primarily used for periodic errors, which can not be compensated (easily) otherwise..
Long-term tracking speed accuracy of EQ6 is quite OK (crystal controlled, 20ppm typical), so if polar alignment is accurate, there is no reason why scope should not be on the target after couple of hours.
BTW, I found out that guiding (EQ6 basic) is not necessary for lenses 300mm and shorter (polar alignment done with polar scope only).. but for 500mm (and longer) it is helpful (and mandatory for longer).
With guiding, I am guessing the polar alignment is not so critical any more.
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