The Tommee Tippee Microwave Steam Sterliser is light and compact, quick and neat and really easy to load, this new steriliser holds four bottles and all accessories in 4 - 8 minutes, depending on the wattage of the microwave. (littleangels.ie)
Program the microwave for full power for four to eight minutes, depending on the wattage of your microwave: 1) microwaves with over 1,100 watts = four minutes; 2) microwaves with 850 to 1,000 watts = six minutes; and 3) microwaves with up to 800 watts = eight minutes. (howtoadult.com)
The exact length of the cycle depends on the wattage of your microwave, of course. (usa.philips.com)