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This is what Iwata said:

"As for the battery, it is inevitable that Nintendo 3DS will be a device which requires more frequent recharging than Nintendo DS. This is why we are going to include the cradle, which is a dedicated battery charger. Perhaps we may need to dispatch to our consumers a message, something like, 'Please place your Nintendo 3DS on the cradle as soon as you return home with it.'"

The fact that he says "place your Nintendo 3DS on the cradle as soon as you return home" should give you a clue. Considering most people have a 8 hour workday, I think it will be around that number.