@Paul ******
In many European countries it's been reduced down to 7 days. This applies for instance, to France which is like 4th in the world for infections now.
Myanmar, during it's second wave actually REDUCED it's quarantine requirement for mild and asymptomatic cases down to 11 days.
Given how much better developed the medical system is in Thailand compared to Myanmar, and how the latter has almost 20 times as many cases as the former, including
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active cases, vs about 120 in Thailand, there is no question that Thailand can safely reduce the quarantine period, even lift it for nationals of some countries such as China, Taiwan, Laos, Cambodia and Vietnam (and Australia/New Zealand).