Here are the laps:
01:24:34 Half Marathon
Average pace per mile: 06:29
First Half vs. Second Half: 1h24.34 vs. 1h25.02 (28secs difference)
The course is challanging and the first half is faster for sure. Km 24 and 25 are very though together with mile 23. Long slight uphills which can kill your legs if you arrive there too tired.