Hi unboggling. I haven't checked Singapore or Philadelphia but my library (not open to nonresidents, sorry) allows a choice of 7/14/21 day loans. They also say that books *cannot* be returned early - I haven't tested this. So books I know I'm going to read quickly I will borrow for 7 days, and books that might take me a bit longer I will borrow for 14 or 21 days. And I stagger my borrowing, so that I might borrow 2 or 3 one day, then later that week I will borrow a few more. This way I never run out of space on my card.
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