I believe it takes approximately 16 hours. You have to water it every 1-2 hours for maximum profit.
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It takes a while mainly because of the training
Get a old amber and take it to a guy in the museum in Petwer City,
This probably means that your game is defective. Get your receipt, and take it back.
If you are trying to catch ditto in heartgold and soulsilver, I found the easiest way is to catch it outside of the daycare, just south of goldenrod city. It might take about five or six goes, but you will find him. I suggest using a quick ball. Good luck!
It took then a long time