Can anyone provide the first daily departure time for a bus or van from Hua Hin to either Morchit 2, Victory Monument, or Sai Tai Mai (Southern Bus Terminal) ?

 - please indicate to which of these locations the van goes.

 - please indicate the departure point from Hua Hin

 - please give an estimated travel time for an early morning departure on a holiday.

I am not in Hua Hin myself.I am attempting to assist someone who has never been there before, and wants to attempt to get to Morchit 2 for a 9:00 a.m. departure from there. Thank you.

https://thailandtravelroutes.com/bus-times-from-hua-hin-to-bangkok/

 

This should give you the information you are after.

I'm not familiar with BKK but there is a minibus, not minivan, that goes to Ekkamai, right alongside the BTS station if that's anywhere near your required destination.

First one is 5 am and every two hours after that. Departs from alongside the MG garage, price 200 Baht.

Otherwise a private taxi will be around 1600 Baht.

Thank you to both of you.  I posted this because I thought it was probably not realistic, which turned out to be correct.  I had advised my friend to make a Plan B, which he did. And Plan B is the one he has now used.