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They say every 3 months but I recommend every 30 to 45 days
You have to still change the blade from time to time depending on how often you use it and I imagine the coarseness of your hair plays a role as well. I change mine out every couple of months or so but use it daily.
No you can get different blades just like razers. I seen that it lasts like 3 months though so thats good
Depends on amount of use. I use it once a week and change the blade once in 6 months the earliest.
The blades have to be replaced. A three pack sells for just under $35 on Best Buy website. Check the Norelco website for details on blade life etc.