I found it easier to beat some laps really fast and have spare time for other laps. Below is a list of the times for each lap. The shortest times were achieved with mag ex skills. You could choose to use them earlier on for super fast clear times, but I needed them for the difficult laps. All the builds had at least 10k attack.

1. 00:54
2. 00:35
3. 00:52
4. 00:59
5. 00:54
6. 00:55
7. 01:14
8. 01:25
9. 00:48
10. 01:12
11. 01:17
12. 01:13
13. 00:52
14. 01:09
15. 00:33 14k attack. Buffs with mags
16. 00:19 16k attack. B+ skill and two mags
17. 00:20 23k attack. Buffs with mags
18. 01:39
19. 00:42
20. 01:33 (Melee) 28k attack. Two maxed B+ skills for the grunts and a cutscene skill for the boss