i was just about to apply today when i get that info from embassy website but something have told me to ask on forum first.i would of loose 5 weeks of my visa as going beginning of December.jow long is waiting time.i was thinking to apply on 20th of November and flying on 1st of December
thanks for clarify as Thai Embassy London have this information on their website which look like 6 months start when you arrive:
Multiple Entry Visa :
Multiple Entry Tourist Visa will be valid for 6 months from the date of issue. Travellers must enter Thailand within the validity of visa, and they will be permitted to stay in Thailand not exceeding 60 days for each entry within the period of 6 months from the date of arrival in Thailand.