What happens if one needs to perform a COVID-19 test within x hours of a flight to Cambodia and the flight is late?

Cambodia, like some other countries, requires travelers to perform a COVID-19 test within x hours. Example. What happens if a flight to Cambodia is late by 1 or several hours and that as a result the COVID-19 test a travel performed is not anymore within x hours before the flight/boarding?
Best Answer
In case of USA, it seems that you would need to be re-tested if your flight is late and has fallen outside the window of X hours. This is what I found on the U.S. Embassy website in The Czech Republic.
Q: What happens if my flight is delayed on my way to the United States and the 3 day time frame expires? Will I need to retest?
A: If your flight is delayed before departure, you will need to get re-tested if the delay causes your test to fall outside of the 3-day pre-departure testing period requirement. A delay while traveling on a continuous itinerary will not invalidate an otherwise valid test unless it results in you leaving the airport terminal or a layover lasting longer than 24 hours.
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