Ive got a  asus strix that i use the fan on 100%, unfortunatly one fan failed but i bought the card second hand so hard to say how much it had been abused. Replaced the fan with a new one and back in action. A 1080ti kfa2 thats been run flat out fans for about 6 months with no problem and a msi 970 thats as old as the hills with no fan failure yet.

Even if they do fail its not a major operation to replace them.