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Female bed bugs lay from 200 to 500 eggs (in batches of 10 to 50) on rough surfaces such as wood or paper. Eggs are covered with a glue and hatch in about 10 days. After hatching, the egg shells frequently remain on the substrate. There are five progressively larger nymphal stages, each requiring a single blood meal before molting to the next stage. The entire life cycle from egg to adult requires anywhere from 5 weeks to 4 months, depending on temperature. When temperatures are in the range of 70° to 82°F, development occurs most rapidly. Nymphs and adults generally feed at night and hide in crevices during the day. Common hiding places include seams in mattresses and box springs, cracks in bed frames, under loose wallpaper, behind picture frames, and inside furniture and upholstery.