Paul McCartney has said that he “blames” Bruce Springsteen for increasingly long stage times.The 81-year-old former Beatle was speaking during an episode of Conan O’Brien’s ‘Needs A Friend’ podcast when he reflected on the increasingly extensive sets that artists are expected to play — and said that Springsteen was to blame.According to the bassist, songwriter and singer, it was The Boss who began the trend of performing mammoth sets that go on for hours, which made it impossible to get away with shorter sets. He also explained that The Beatles would often only play for 30 minutes during their ’60s heyday, and this was never an issue with fans.“These days, pretty much there’s the main act and there might be a warm-up act,” he began.