We had to go to bed early because we have to be up to catch the minivan to Huahin the next day.
We had to take BTS over to nearby Victory Monument from Ratchawitee Hospital. We felt that taking the minivan is the most convenient way. It's 200 THB to Huahin and no reservations needed. Unlike a bus, tickets have to be booked at the bus station beforehand and it costs 160 THB and it takes a longer time to arrive.
Generally, it's 2.5 hours to 3. Yeah I think it took us 3 hours. Knowing Bangkok and its rowdy traffic jam, so put in more time for that.