N95s are fine for prolonged use. Study after study has shown that wearing a mask has a negligible impact on blood saturation, heart rate or cognitive performance.
"Wearing masks in the community probably makes little or no difference to the outcome of laboratory‐confirmed influenza/SARS‐CoV‐2 compared to not wearing masks (RR 1.01, 95% CI 0.72 to 1.42; 6 trials, 13,919 participants; moderate‐certainty evidence)."
come on now, be more creative.
the cochrane review has been debunked a thousand times. event the authors expressed concerns about how their conclusion was interpreted and themselves pointed out the flaws in the review design
https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD...