usally about 10 hours compared most like the ds lite which lasts about the same time
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The Nintendo DS battery has been made to be recharged around 500 times, after which the battery life will be 70% of its maximum charge. The length at which a rechargeable battery will last depends on how frequently you charge it. For older devices, it is usually recommended to allow the battery to drain as much as possible before recharging.
Why would you leave it on anyway? And yes it's bad. It wastes battery, and your ds can only last 500 charges before it starts to stop working.
probably I did last year and had no problems.
Last time I heard, you have to go to a Nintendo Event.
First you have to go to system settings. Then go to the last page and click language.