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Nico:
are you using the CG5 Mount? If so around 30 to 45 seconds seems to be about what people get without tracking errors even when polar aligned.
with autoguiding however this improves out of sight.
I use Guidedog-guidescope, not an OAG-with my CG5-and with halfway decent polar alignment I can get upto 20 minutes exposures with no trailing on my Canon 300D-and no field rotation. Havent tried for longer exposures who knows may be possible.
PS You can use GuideDog for help in polar alignment as well..just look at your dX and dY numbers after locking on to a star and that will tell you how your tracking is going
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