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).
"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...