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Unfortunately it doesn't quite work that way Grant. It would depend on your altitude and azimuth you want to image and the amount and direction your are out of polar alignment.
But if you want to take 5 minute shots with a DSLR through and ED80 then you will have to be damn close.
What are you using to get polar aligned? Illuminated Reticle or webcam and software? FYI using software polar alignment I have gone more than 10 min unguided in DEC. As for RA it depends on how big your periodic error is and the time for the worm to complete a full cycle. eg losmandy G11 is 8 min but I think the G8 is only 4 min.
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