I’m set up for auto calibration so after selecting a guide star I’m guiding in a few seconds
Depending on seeing conditions my best guiding has been 0.74arc sec and usually averaging around 1.2 to 1.5 arc sec
I have taken 5 minute exposures with round stars but I do use a Baader coma corrector which helps using an 8” f5 newt
My guiding seems to improve a bit if I manually select a guide star with a higher SNR say between 45 and 60
In lieu of PHD2 selecting one for me which usually has a lower SNR around 29 to 40
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