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Depends on the guider type and guiding scope FL. With a QHY5 guiding through a finder or an ED80 at prime focus (600mm FL) or a newt 5" F/5 at 650mm FL I never had a problem finding a bright enough star at 1s and over, even 3s. With an OAG on the C11 at F/10 (2800mmFL), 1s would be the minimum to pick up a star with the QHY5. With the SX-lodestar I can pick up stars at F/10 still with 0.5s exposures if I take darks. That's what works for me with my G11.
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