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.
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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.
That's best consulted at an online skill calculator, such as the ones available at salmoneus.net, or runescape.wikia.com.
202.5xp per log that is used for firemaking.
between 180-200
You will need around 67,566 yew logs cut to get from level 75 Woodcutting to 99. a deuce load of yews im on 70wc so I need a deuce load