8 hours in my ears and they do their job perfectly, I tried the noise canceling and it's very good but I always use them without activating it.
In the summer, if you wear them for so many hours, you get the feeling that you're getting warm and of course your ear sweats. In the winter, you don't have such an issue.
Even though I received them as a gift, I would say that they are worth their 100+€ price.

Not at all satisfied with the purchase.
I bought it because I wanted to be able to hear my colleague with the press of a button, but that's not the case at all. The sound insulation is not good at all for heavy industrial use. For anyone who wants it to not hear the neighbors, it does its job, but for something more, it's not worth spending so much money.

I paid extra to have the selective insulation and the connection through a device (mobile, etc.). Without batteries, they function normally as ear defenders and cut off noise perfectly. With the batteries that come with them, you have the ability to choose 5 levels of sound insulation, meaning how much noise you want to cut off. You can also connect them to a device, for example, wireless, mobile, etc., using a 3.5 mm male-to-male aux cable, which you have to purchase separately.