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It obviously depends upon the focal length and exposure times, but at say less than 50 mm full-frame-equivalent focal length for less than 3 minutes, I find that it's enough just to eyeball the SCP.
With careful compass alignment I can get up to 1-2 mins @ 200 mm without trailing. Others have reported about 3 mins using the polar scope.
The longest exposure I've taken without trailing is 7.5 mins @ 50 mm using a quick drift align assisted by PHD (i.e. <= 1 pixel drift after 20 secs on my Orion ST80+StarShoot auto guider).
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