Philips AVENT Microwave Steam Sterilizersterilizer container (1x) The microwave steam sterilizer can be used to sterilize baby bottles and other products in just 2 minutes, killing 99. 9% of germs and bacteria. The exact length of the cycle depends on the wattage of your microwave, of course. 2 minutes at 1200 1850W, 4 minutes at 850 1100W, 6 minutes at 500 800W. Contents remain sterile for up to 24 hours if the lid is unopened. Measuring just 6. 5 by 11 inches (17x28cm), it is small enough