Quick question: (can't seem to find the answer on the embassy website)
With a Non-Immigrant Type B visa – is there a restricted window from the date of issue to entry date?
The say way there is with an SETV visa, which has to be used within 3 months.
TLDR : Answer Summary
A Non-Immigrant Type B visa has a validity period of 90 days from the date it is issued, which is consistent with other single entry visas. This means you must enter Thailand within 90 days of the visa's issuance.