How long does 99 woodcutting take

This depends on what type of log you cut and which hatchet. with the new release of ivy, it is possible to get 80,000 experience per hour or more. if you use sacred clay hatchets leveling is much faster even getting 100k exp/hour. yew logs with a dragon hatchet give approx 45k exp per hour while dragon hatchet at willows gives 50k exp per hour. another possible alternative would be to chop teaks. you can get around 85k exp per hour with dragon hatchet. But you must drop the logs, since their is no bank.

i would say with dragon hatchet woodcutting 99 at yews would take about 250 hours.
chopping ivy with sacred clay hatchet takes around 100-150 hours including the time to get hatchets. I do not recommend getting the hatchets.

i would not suggest doing magic logs as the experience is so low (like 35k exp or less per hour) and the 100k coins per hour isn't worth it. yew logs offer just about the same profit, if not more, and give much more exp.

Good Luck, and Have Fun..Add me if you have any more questions my username is Lightz Off