HCMC Vietnam question.

( apologies in advance if the answers to my questions are obvious. I don't see a consolidated answer on here , so was hoping for a response from someone with firsit hand experience )

I live in Thailand but work all over Asia so quite hard to tie down exact dates, but of course will make it work.

I read that people are are applying online for the HCMC and waiting 2 weeks for an appointment.

1. Is the 2 weeks a minimum ? Set in stone ?

2. Can you select a range of dates for your appointment?

3. Can I only apply once inside Vietnamto lock in the appointment. I'm aware that proof of arrival are required. I'm just not sure that is needed at the start.

I will be providing the following. My Thai address will be our family villa in wife's name.

1. Passport copies

2. Passport photos x 2

3. Latest wage slip. More available upon request.

4. 6 months bank statement. Latest balance of bank balance. More available upon request.

5. Letter from company, confirming my salary, length of employment and remote work ability.

6. Singapore Tax return. Showing taxes paid in full.

7. Proof of address in Thailand on bank statement.