I have just dug out my old blue/green tommee tippee steriliser that goes in the microwave and I can't remember how long it goes on for. I looked on the web site and the new one is in for 4 minutes, but I have a feeling that I used to put my one in for 5 minutes. Not sure if it is that vital, but I'd rather get it right. Anyone have the same one and kept the instructions???