What is the correct intended date of departure for my DTV (Freelance Visa) application in Thailand?

I am currently applying for a DTV (Freelance Visa) from the U.K.

I have bought a flight and entered the date and flight details, now I must add an "intended date of departure"

-It is a five year visa that I am applying for, so should I put in a date five years from my initial arrival?

Or should I enter a date that is within 180 days or my arrival?

It is a bit unclear.

Any advice would be greatly appreciated.

Thank you kindly.