I was in Chiang Mai for Songkran last year as well and previos posters are right, it is the same for the whole week!! I guess the first day would be the craziest, but you won't even tell the difference :)
Just keep in mind that although it is an amazing experience, you might get sick of it if you stay the whole week. In my opinion, 2-3 days is more than enough but everyone is different. Just be prepared to get soaked with ice cold water everywhere you go and enjoy it!!
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