How much money I need to spend 9 weeks in Thailand ?

A couple friends and I are coming over from the end of November until the end of January. We’ll be attending the Full Moon Party for New Year’s Eve, but other than that the rest of the time shall just be spent lying on beaches and the odd trip such as seeing the tigers and elephant riding but that’ll obviously only be done the once throughout our trip. How much money is a good amount to take, to see us through these 9 weeks for hostels, food and drink? We’re not sure how much is a substantial amount to save?



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