So it will end in season 6 (2010). And interesting in the last two paragraphs:
Will Lost risk losing fans' interest with an eight-month lag? "People wait longer than eight months for the next books and films in the Harry Potter story and they don't seem to lose interest," Cuse says. "We have faith that our audience, knowing exactly how much of the story we have left, is going to be with us for the rest of the ride."
But, Lindelof says, "the last five minutes of (this month's) finale are going to seal our fate."