I used to leave them in until I lost one. Different reason than you were inquiring about. I shoot out back and not at a range. Taking the muffs on an off caused me to accidental, and unknowingly at the time, dislodge the left hearing aid. I was not able to find it even with retracing my steps. The brown or flesh color camo'ed it with the environment.
Some muffs are better than others and some firearms are louder than others. Some folks like to double up with ear plugs and muffs. Then there are times when you need to hear enough when others are around and when there might be a range officer. If I am by myself which is most of the time, I remove them while using muffs. So, I guess it all depends.