How to turn off automatic time readout?

[AC Question]

I probably accidentally turned on the "read time aloud" function on my Galaxy S6 (Android 6.0.1) through a key press combination but have no idea what app does it or if it is a system functionality and, above all, how to turn it off!
Any help welcome.
(And yes, I did google for answers and searched the forum, so you don't need to ask)