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I've got a HP ScanJet 5590, primarly used for document scanning (it's got ADF and duplex - but duplex is useless, because it takes about 3 times longer than scanning one side, then manually scanning the other side). It needs slightly longer than 20 seconds to warm up when it was turned off (I unplug it when I don't use it, because the power supply emits high-pitched sound), and needs a bit less than 50 seconds to scan a full page at 600DPI (from flatbed - while 600DPI works from feeder, the vertical resolution seems to be limited to 300DPI).

Speaking of quirks, the scanner has 3 drivers - a basic WIA interface, "consumer" TWAIN driver and "commercial" TWAIN/PixTran driver. The consumer TWAIN driver doesn't work with Paint Shop Pro to scan from glass - only scanning from feeder works. Only the consumer driver seems to support 16-bit scanning.