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30 seconds seem to be at least somewhat covered by their ToS.

"Prices are measured between the purchase date and the departure date of your eligible itinerary." [1]

The key things to interpret there are "between" and "departure date". For example, I would interpret that as price changes on the day of the flight don't count. (i.e between is exclusive and date means the date, not date and time).

[1] https://travel.google.com/intl/ALL_us/booking/flights/guaran...

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