When will Thailand be full democracy?

Answer 1

Thailand will only achieve full democracy if the military sector will not intervene politics and stop staging coup d etats to take over government control.

Answer 2

Tuesday?
No, seriously, Thailand will become a full democracy when enough people stand up and demand it.
You can make a start by practising democracy. Visit myverdict.net, get your community involved, get the whole of Thailand involved. The government are few, the people are many, if enough of you want democracy, it will happen.
As an aside, I visited your country many years ago and found it to be one of the most beautiful places on the planet.