There is a number sitting at the heart of Leinster’s build-up to this weekend’s Champions Cup semi-final against Toulon that tells you more about the shift in Leo Cullen’s thinking than any press conference or selection announcement. That number is 602. Six hundred and two minutes. That’s the combined match minutes accumulated by today’s starting XV in last Saturday’s URC defeat to Benetton – a game played seven days before the biggest game of Leinster’s season. It is the highest pre-knockout minutes recorded in any of the five seasons analysed. It is more than 13 times the equivalent figure from…