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8500 ms is WAY TOO LONG!
Remember, what PHD is doing is taking a picture, moving the mount, taking a picture, moving the mount, etc. Each motion is "calibration step size" long. So, you're moving the mount at guide speed for 8.5 seconds each time.
I'm going to suggest something here that I've suggested to a number of users. PHD isn't actually moving your mount and you're not actually calibrating. Drift and/or PE are faking a calibration (PHD doesn't know if it moved the star or if something else did -- it's smart, not psychic). Use the Manual Guide dialog to make sure your signals are really getting through to the mount (I can hear my motors change pitch for example). On my 250 mm f/l guide scope I run a second or two for the cal step size and that's probably as long as you should ever need to go on it.
Craig
PS - I'm the author of PHD.
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