I have a code shared flight linked on Singapore Air from LAX to Manado, Indonesia through Singapore. The LAX/SIN flight is Singapore Air, then Scoot Air SIN/Manado. I check my bags all the way through from LAX to Manado and have an 8 hour layover in SIN without leaving airport. I have to have a PCR test as follows: "Passengers must have a negative Covid-19 PCR test result taken within 48 hours before departure from the first embarkation point." QUESTION: Is my first embarkation point SIN or Manado? QUESTION 2: Is it 48 physical hours or clock/calendar hours (not accounting for time zone difference)?