According to Official Guinness Records,
The most seats sat on in one minute is 86 and was achieved by Robbie Savage (UK) at Wembley Stadium in London, UK, for Sport Relief, on 13 March 2014.
This was part of a head-to-head challenge in aid of Sport Relief between Robbie and fellow 'Match of the Day' pundit, Alan Shearer. Alan managed to sit on 85 seats within the time limit but was beaten by Robbie by just a single seat.
For a complete list of 2014 records, please visit 2014 Guinness Records in United Kingdom.