@Koin *****
simply because they prioritize people applying within 3 months of their intended travel. And well, simply because they say so. It’s Thailand, it’s not all meant to make sense 🤷🏻♂️
That “should apply within 3 months” statement is used for pretty much all visas. It’s a generic/general thing. Its DTV that is unusual with its 5 years validity.
You should state a intended arrival day within 3 months from when you apply. But you don’t have to honor that. After you got the visa it doesn’t matter. 5 years as many already mentioned