Due to our changing our award ticket, we're flying from BKK to Koh Samui via Phuket on two different airlines.

How long do we need for a connection in HKT? Options are 1h 15min or about 3 hrs.

We'll be on Thai for BKK-HKT and Bangkok Air for HKT-USM. Can we check our bags the whole way or do we need to collect them and recheck?

Thanks!