Update. This information on worm period was recently confirmed by a CGX owner in the US and verified by Celestron:
One of the things we discussed was the tooth count and worm cycle time for the two CGX models.
From the horses mouth (Celestron)...
CGX 180 teeth and 478.6794 seconds (7.9781 min)
CGX-L 288 teeth and 299.18809 seconds (4.9863 min)
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