Opportunity is missed by most people because it is dressed in overalls and looks like work. - Thomas Edison
While many people (including press mfgrs, ink chemists/distributors, consultants and "experts") advise this as a necessary precaution this can actually cause problems. Given the proper chemistry and airflow most times you can leave a screen open for as much as an hour. Flooded WB can quickly skin up. We never do this.
Couldn't say without being in your shop but we do it all day every day. Lunch is 45 min.