How do I apply for an education visa in Thailand, and what are the requirements for duration and insurance?

The original poster is seeking clarification on the duration to declare when applying for an education visa in Thailand for a 4-year university program. They are also asking about the insurance requirements, specifically whether proof of coverage is needed for the entire 4 years or just the initial 90 days. A comment suggests that the duration filled in for the stay may not be critical, and that insurance coverage should only be for the duration of the initial entry, with additional requirements for re-entry.