Brother MFC scan speed?

I am hoping that if anyone has a laser Brother MFC (like an 8460N or
something similar class-wise) that he or she can give me a ballpark
idea of what the scan speed is.

I understand it depends on several factors, but I'm looking for a
figure for 200 dpi, B&W, typical office documents.

Brother refuses to even guess for me although they're more than
willing to give a typical fax speed which involves also scanning and
digitizing a typical office document.

Thanks much