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Watching the dither process between APT and PHD2 I reckon on a reasonably still night it takes around 30-40 seconds. Only a handful of seconds to actually make the dither, the rest of the time is the time taken for guiding to settle down again (Which APT monitors via the distance to the guide star meeting a threshold in pixels) and then additional wait time configured in APT for settling.
Like everything in AP, I found that trying to scrimp on the settle time meant time saved but worse results, but I am imaging at approx 1500mm so YMMV as they say.
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