Part 1 of Harry Potter and the Cursed Child is 2 hours 40 minutes (incl. interval), and performances starting at 1pm will finish at approx. 3:40pm and performances starting at 2pm finish at approx. 4:40pm.
Part 2 of Harry Potter and the Cursed Child is 2 hours 35 minutes (incl. interval), and performances starting at 6pm will finish at approx. 8:35pm and performances starting at 7pm finish at approx. 9:35pm.