I just could not find any sources where it says it is exactly same as 9 to 5, but I personally think it should not be considered 8 hours a day. It still means that one spends 2.5 hours more per week.
My current company has a rule that says the 30min lunch time is not paid, but literally most of the employees exactly leave their work at 5PM considereing they started at 9AM. At first I did not give any thought about although I knew the lunch time is not included but it was logical. However, recently I was told by my supervisor that it must be 8 hours plus 0.5 hours as mandatory to me, when most folks leave just at 5PM. I tried to talk about then I realised 30min is not much of a deal and did not want to make a fuss about it.
In reality leaving 30min early can be a huge life changer, because I have a training session starting at 5.30PM and half an hour early means I would be already home by 5.30PM when I normally finish etc.
I live in Hungary by the way. I just feel like I am not working 40 hours per week, but more like 42.5 hours per week in an office.