With the advantage of under 60 hours... it also comes with a disadvantage... 100% LOSS. Every bit of money you invest into this quick method will not be coming back to you...
What you do... Is:
Firstly: Complete Smoking Kills quest (85 cb + 35 slayer req.)
Second: Broad Arrowhead on Headless arrow (both around 40-60 gp each)
Third: Use them on each other.
That there, is the fastest way to 99 fletching... Though you do need about 20m spare because you will not make 1gp...
What you do... Is:
Firstly: Complete Smoking Kills quest (85 cb + 35 slayer req.)
Second: Broad Arrowhead on Headless arrow (both around 40-60 gp each)
Third: Use them on each other.
That there, is the fastest way to 99 fletching... Though you do need about 20m spare because you will not make 1gp...