I couldn't figure out how to use speedrun timer alongside the game, so here are the splits(approximately):

Chapter 1: 3m 50s Chapter 2: 6m 51s Chapter 3: 11m 21s Chapter 4: 15m 12s Chapter 5: 19m 8s Chapter 6: 22m 5s Chapter 7: 27m 23s Chapter 8: 30m 33s Chapter 9: 34m 41s Chapter: 10: 39m 47s Chapter 11: 45m 53m Chapter 12: 52m