Philips Avent Microwave Steam Steriliser is a great choice for fast, effective sterilizing at home or away. Up to 4 Philips Avent bottles or products can be sterilized at once, with 99.9% of germs killed in just 2 minutes. 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.