I should point out that when I've done this with ebooks in PDF format that I've checked out from digital libraries and that I've read on my Sony Reader via Adobe Digital Editions, the expiration date (2 or 3 weeks depending on the library) shows up on the Reader in the menu. Once the expiration date is reached, it displays "Expired" but continues to be readable for another 2 or 3 weeks. That is, I believe it is automatically renewed for the normal checkout period.
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