How much experience is too much for a traditional 2 year MBA

No concern whatsoever, and especially for those schools. Sloan actually likes slightly older students. HBS and GSB like younger applicants, but you are still very much in the zone.

Well, those are just rumors.
From the class profiles of the incoming classes of 2019 at top schools, a safe bet is that work experience of over 10 years for business schools in the USA, and 12 years for business schools in the UK could be considered a challenge for admission to a two-year traditional MBA.
Look at the average work experience for the incoming class of 2019 for some of the top European schools.
HEC Paris- 5.8 years
INSEAD- 6 years
London Business School- 5 years
University of Cambridge Judge- 6 years
University of Oxford Said- 5 years
Now, some of these business schools also have 20% of students with work experience of over 15 years.
If you have a string equation of employability, your 7+ years of work experience won’t be a problem for the admissions committee members at your target business schools.