Of course not all Germans go for lunch at 12-1 but unless you are in retail or your team has decided 1-2 is better, or 30min is enough.. I think it's just a very good guess that it's 12-1 for most the people. If it was a real 50:50 split between 12-1 or 1-2 then it could look like a 2h break. Unsure, I can't read their data properly.
Of course not all Germans go for lunch at 12-1 but unless you are in retail or your team has decided 1-2 is better, or 30min is enough.. I think it's just a very good guess that it's 12-1 for most the people. If it was a real 50:50 split between 12-1 or 1-2 then it could look like a 2h break. Unsure, I can't read their data properly.