If you're paying attention constantly, you can burn about 1.1k maples per hour, which is 148.5k exp/hr.
actually its impossible to get 148k an hour even with the fastest bot in the world..... if you dont have a bot or whatever you can get liek 60-80k an hour and with a bot its like 90-100k..... no way anyone can get 148k unless then use like magic logs or something - Runtkirk4
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For this type of question, use an online RuneScape skill calculator. Thus, you can not only get the experience for "maple logs / 99 firemaking", but also quickly experiment with other target levels, and other types of logs. There is one at Salmoneus' site (runescape.salmoneus.net); but there are others, too.
Teak Logs.
Roughly 1.3million
It would take exactly 2555 willow logs.
Anywhere if you have logs and a tinder box, or on the various stoves