I worked on a covid unit and wore the N95 for 12 hrs minimum. I learned quickly that a 10 minute break every hour is necessary to prevent CO2 build up in the lungs..anyhow, it was very difficult. I grabbed a breath of fresh air every chance I got. I also want to say, some of my difficulties could have been r/t anxiety too. I was sooo glad my shift ended after 10 days. Those who act as though there is no big deal in wearing masks should check out the nurses who are in the hospital for carbon dioxide poisoning and irregularities in their heart...that's about a 3 day hospital stay...I'm thinking they were of great health prior...just saying and a New York physician who wore one for 30 minutes walked out of his job. These masks are not for the faint of heart. Follow your own path. Apparently in health care the only one who advocates for you is YOU.