German to English Marketing Marketing Erhebung/Survey

I wonder if "field days" would be correct in what I have to translate. The context is a report on a health survey carried out by telephone by the RKI. There is a table and before the table this sentence:
"Die durchgeführten Interviews verteilten sich auf die **Feldtage** sowie die jeweils arbeitenden Interviewer wie folgt:"

The word appears again, obviously with the same meaning, as the heading of the table:
Durchgeführte Interviews / **Feldtage**

The table itself does not have the word but lists a number of days when interviews were carried out and how much time they took on average per day. I suppose that Feldtage here means days when the survey was carried out. Can we use "field days" in such a context?
Doesn't sound quite right to me.
Suggestions and comments very welcome.
YorickJenkins