That is what I thought - however , my friends plants the same ones he gave me - Do terrible inside my place - until he told me I need to change the water every 2 days - this might explain why my leaves turned yellow.There is no set time. Judge by the health of the plant and appearance and odor of the water. If all looks good, it likely is so.
I've literally grown plant such as different as Syngonium podophyllum and Aspidistra elatior in glass vases of water for years. The only care is to ccasionally top up the water, and even more occasionally give just a splash of liquid fertilizer.
The same goes for Lucky 'Bamboo' (Dracaena braunii and/or D. sanderiana), which is now likely the most popular of all water-grown house plants.
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