So far I have scanned a maximum of 6 pages and saved them as a pdf file, I have never needed the double page function. Best regards, Turi

I can only agree with the previous speakers!

Hello Markus
There is space for 50 sheets in the document feeder (ADF) according to: https://www.brother.ch/de-ch...
("50-sheet automatic document feeder" it says).
PDF is also possible, of course. Experience has shown that the resolution setting is decisive in determining whether it works or not with this number of documents.
Personally, I use the Brother "iPrint&Scan" app (Android, Windows), which works very well and I can create "profiles" in the app so that I always have the same settings (resolution, pdf, ocr, jpg, file path, name, etc.).
If you want to scan documents that are double-sided (front and back), I would go back to the MFC-L3770CDW (my machine). This is possible in one "pass" because there is a 2nd CIS in the ADF.
If the volume is large, e.g. 20-30k per year, I would go for a pure scanner, as this is much more robust.
Greetings