Alternative: You can buy twice as OSRS gold many logs to fletch all the bows and string them. This would significantly reduce the cost, based on Grand Exchange prices. This strategy is recommended when you don't have a lot of coins lying around, but it could be a little slow.
Level 70-80. Okay, you're in one of the most difficult aspects of leveling your fletching. You will need to make 8,323 Yew Longbows (s) prior to buy RuneScape Mobile gold reaching level 80 All I can offer is good luck because this is quite a number of bows.