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Are you sure? It's a 6h window on the page

Not sure what you mean by "it", but the doubled usage would be 18h a day.

What I mean is that "it" - the advertised window during which the offer applies - is not 5am to 11pm as mentioned by the poster above.

The advertised window is peak time (6h per day). The doubled usage applies off-peak (18h per day).

Ah! Yes, I got tripped up by the negation. Cheers