How long can you wear them? My issue with all these new ear buds which have a rubber membrane which prevents sound from escaping is that it feels like there is

How long can you wear them? My issue with all these new ear buds which have a rubber membrane which prevents sound from escaping is that it feels like there is no fresh air reaching my ear which would be able to carry out built up humidity. Couldn't this cause infections? I can only wear them for so long, while the older ones, the small ones which have foam ear pads are wearable all day long.