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They can stay lit... until they run out of battery. Which, depending on the level of light and use of wifi (and how much the processor is used) is very variable. Mine last about 7 hours with minimum light setting and wifi on (listening to a web radio). I would say around 6 hours if I'm playing a game at the same time. And if I put the light at the maximum setting... perhaps 4 hours.
If you need some extra battery time, you can buy an external battery. Some are quite cheap and will allow you to double (or triple) the battery life... It's what I use when I travel to places where I might not be able to charge my devices for a long time.
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