My theory that the full guide gets updated was wrong. I slimmed my channel line up down to just 7/51 channels and the guide update went much faster. I may have to experiment a bit but it seems to be an above-linear increase in time to complete vs channel count.
Ie: 2 channels takes 2 minutes for complete update but 8 channels takes 9 minutes for complete update… and so on up the scale.
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