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That's a lot. In my experience, I handed money to people who gave me bills for anything ceremony related. Be it food, flowers, stuff for the monks. Electricity for the temple for the hours we were there. We got a lot of money in envelopes when we made merit for my late Auntie on 100th day after her passing. I still have 5,000 Baht left from then, and will use it for the upcoming anniversary ceremony.