How often should you replace F20 mask?

I have the F20 memory foam mask. I wipe it down with a baby wipe daily, but I feel the foam is never clean. I have used it for 2-3 weeks and am noticing a little wear on it already. The DME is sending out a new one. I know I don’t have to go by their schedule, but how often do you typically replace the foam part? Thanks!

However long you can.
How clever of them to make a cushion that is not washable!
Some users have found a fabric mask liner (pad a cheek) can add some mileage.

Forget schedules..they only benefit the supplier. When it doesn't hold a seal, it need replacing. Al;ways keep a spare in case something happens at night or on weekends.

It is the oils from your face and the cleaning wipes that contribute to rapid memory foam cushion deterioration. I am going on 9 months with my original mask. I use a mask liner and never sleep without one. I change my liner as needed - typically once a week.

Mask is as good a new and seals perfectly!

You are referring to the mask cushion. I wear mine until I cannot control the leak rates.... so far about 3 months. The memory foam on the F20 cushion will start to break down. That's when you change it.

Sheriff