Best way is to go to a non-member world and find a world that has a shop with over 10k willows in it and buy 26 and burn then go back in and keep doing that.
You are looking at 131,378 Willow Logs.
You will need 150k willow logs to get 99 firemaking. I suggest using maples and yews after because it is faster.
less than 3 months
1,228,825
this will entirely depend on how many hours a day you plan on training with these and what your current firemaking level is.
1. Cooking - It will take around 3 weeks to get 1-99 cooking. 2. Fletching - It will take around 1 months to get 1-99 fletching. 3. Firemaking - It will take around 2 months to get 1-99 firemaking. All 3 fastest and easiest stats cost quite alot of money: Cooking - 20m Fletching - 15m Firemaking - 5m and actually fire making is very hard i would recommend a bot
144, 679 willow logs, which equals to 2,025,506 GP if you want to buy them all.
If you get 99 firemaking, you'll want to get in in camelot. The firemaking tutor is near camelot (can be teleported to with 45 magic). You'll need to bring 99,000GP to buy the cape and hood though. If you already have a 99 skill, the cape will automatically be trimmed. If not, its just a regular cape.
It all depends what level your Firemaking is. lets say your Firemaking is 58 (Just high enough to burn eucalyptus logs) you would have to burn just over 66,000 eucalyptus logs.
as long as you want baby, i can go forever
24814 Maple Logs.
Maples, and I'd guess around 90,000. I got my 99 a while ago.