How often do you need to change the Bic Soleil razor heads?

I accidentally bought the Soleil razor heads instead of getting the Venus razor heads. So I bought the Soleil razor but it doesn't specify how long I can/should use each of the heads for. Usually I use the Venus razor heads for about 3 months (it takes about 3 months for the blades to get dull).





Please let me know.|||When the blade is wearing down orif it gets rusty and its not shaving as well then you should change it. Maybe about after 7-10 times that you have shaved your legs.|||I betcha the same amount of time. When it starts pulling your skin. Venus is triple blade, right? Is that what the soleil is? Then 3 months it is!