When is the latest I can take a COVID-19 test in Medellin for international travel?

Okay…

Help me figure this out cuz my head is mush after all this.

My flight leaves Medellin Colombia January 21 @ 10:38am with Avianca and lands in Bogota Colombia at 11:35am.

I then fly from Bogota to LAX, again with Avianca at 1:40pm.

I spend 3H50M at LAX and so a self transfer.

At 10:25pm I fly 17H and 50M with Singapore Airlines to Singapore landing at 8:15am on Jan 23.

I have a 1H30M in Singapore and then at 9:45am fly with Singapore Airlines for 1H40M and land in Phuket at 10:25am.

My understanding is that the US requires a test taken <24 hours before boarding. Singapore requires <48 hours and Thailands requirement is <72 hours.

I want to take a test here in Medellin that will be usable for the full journey.

When is the earliest I can take that test?

I feel kinda dumb rn but it’s all just been so much in my 🧠 man