Fletching Question For Runescape?

Alright So I'm at 93 fletching, and i was wondering how long will it take for me to get to 99. I Have just started 93, so...yeah. I'm doing yew logs then stringing them. I Currently have 5.9m xp left till 99. I need to know how long it will take, and how many yews. Btw, my RSN Is: Going Green