If you can get through the first 3 runs, things really get interesting

0:30 Run 1 - level 2
6:10 Run 2 - level 2
9:20 Run 3 - level 2
17:11 Run 4 - level 2
28:26 Run 5 - level 3
48:18 Run 6 - level 3
1:04:50 Run 7 - level 3
1:20:10 Run 8 - level 3
1:34:10 Run 9 - level 3
1:51:36 Run 10 - level 3
2:05:50 Run 11 - level 3
2:23:00 Run 12 - level 3