They should get 1.5 hours - on the recent tour they were playing for 2 hours 15 roughly which most nights was 26 songs. So maybe closer to 18 (depending on the songs of course!).
As a first listen, tracks I'd recommend to get you started would be Mr November, Day I Die, England, Eucalyptus (very very good live), I Need My Girl & Mistaken For Strangers. Most of those would get played at Glasto too & if you enjoy, then just branch out and check what's frequently popping up on the recent setlists here - hope you enjoy!