What is the validity period of a Non-B visa after picking it up from the consulate, and when does it start?

The Non-B visa is valid from the moment it is issued at the consulate, not from the date of re-entry into Thailand. It has a validity period of 90 days from the issue date. Upon entering Thailand within this 90-day window, the entry stamp will be issued for another 90 days, regardless of how close the visa's issuance date is to the entry date.