How often do you wash your face towel?

I use a microfiber towel (which I love) to pay my face down after my cleansing steps and I’m trying to get better about washing it but I’m just wondering exactly how often I should wash it. Part of me thinks having a 100% clean towel every time would be really nice but that seems impractical unless I had like 7 of them and washed them all at the end of the week. The towel is only ever touching clean skin, so how often should I be washing it? Have you guys noticed any change in your skin when you washed or forgot to wash your face towel?