Depends on the species for me. I have some lizards that need changing daily, sometimes even twice - or more - daily, because they seem to drop just about everything in their water, whether it's poop or some salad or floating crickets or kicking the substrate in... it seems to constantly need changing and those need to be changed at least every day.
The majority of my snakes though ignore their water and I change it when needed, spot clean and check the water daily but it often doesn't need changing daily for snakes.
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