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COVID Test Requirements - Travel to Rome Leaving 12/26/21

I will be traveling to Rome on December 26. I leave from San Juan, Puerto Rico on a direct flight to Madrid and then a connecting flight to Rome. Am I correct to infer that I have to take an antigenic test 72 hours before arriving? Or is it 48 hours since I will be in transit from Spain?

Leave San Juan, Puerto Rico: December 26, 8:20 PM Eastern
Arrive Madrid: December 27, 10:25 AM, local time
Leave Madrid: December 27, 1:20 PM, local time
Arrive Rome: December 27, 3:45 PM, local time