33k in the air brought up a point I never thought about. I've read about disruptions to industry even though precision bombing wasn't. It never occurred to me to consider downtime due to running for shelter, waiting for the "all clear" and getting back to the factories.
And applying for relief if bombed out or having ones home damaged. This usually took two to three days and almost all employers allowed compassionate leave for this..
The British were interested in estimating the effects of the nuisance raids by the Light Night Striking Force. which flew nightly or twice nightly to targets in Germany, triggering air raid alarms and dropping relatively light loads, up to and including 4,000 lb HC bombs (cookies).
In post war interrogations the directors of the Siemens Schukert and Halske factories said that the raids caused a constant drain on the production of both concerns. Workers were sent to shelters each time an attack developed. Those on night shifts were kept awake, and they were often those sent home early to avoid travelling during the bombing.
Siemens Schukert estimated that they lost 1.5 MILLION working hours in the last few months of the war. Halske reckoned their loss at 2 MILLION hours.
These are not figures you will find in the highly biased reports of the USSBS or BBSU.