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| Factor | × | How it was derived |
|---|---|---|
| Style | 1.05 | FullSpeed 1.05 ← |
| Difficulty | 1.80 | Advanced |
| Length | 0.80 | Bucket 0 (up to 20 s)bucket inferred from the author time |
| Bonus | 1.00 | No bonus applies |
10 × 1.05 × 1.80 × 0.80 × 1.00 = 15.12, rounded to 15. Why these factors.