How long can wiis stay turned on?

Because Wiis do not have an automatic shutdown after a certain period of time, they could theoretically stay on forever. Unfortunately, in that time you would probably lose power. If somehow you had an unlimited perfect power source, your Wii could stay on until it disintegrates. On a completely different note, if your Wii doesn't disintegrate, get crushed, overheat, or lose power, it may be discovered by aliens a gazillion years in the future. Possibly Video Games were really invented when archaeologists found a fossilized Nintendo...