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.
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It all depends what level your Firemaking is. if your Firemaking is 60 (Just high enough to burn yews) you would have to burn just under 63,000 yew logs. I would suggest burning maple logs, you would have to burn around 93k but it's a lot cheaper, but if you want it done fast yews is the way to go.
144, 679 willow logs, which equals to 2,025,506 GP if you want to buy them all.
You will need 150k willow logs to get 99 firemaking. I suggest using maples and yews after because it is faster.
You will need approximately 143,584 willow logs to get from level 53 to level 99 Firemaking.
Use an online runescape skill calculator for this type of questions. In general, however, firemaking is one of the faster and cheaper skills to train - and now that you can add logs to a bonfire, it is less effort than it used to be.