It won't work. You will be caught, and your account will be banned.
It takes a week and a day (source) 99 Woodcutting :D
10,613,344xp
1,228,825xp
513 Hours Mostly like 2-3weeks
This entirely depends on what level you are starting at and what you are using to train the skill.
I bet a few hundred people are pondering over how long it will take. From 78 Woodcutting to 99 Woodcutting can take from months to weeks, depending on what you want. You either can go for Money or Experience; Ovbiously everyone would want Money, However! The money way will take any where from 3months to a year. The easier route (That would make more money in the long run) is Ivy the 2009 Update, currently the fastest way to 99 Woodcutting. Requiring 68 Woodcutting, it is VERY popular. This is the best route.
like a week if u play for 2-3 hours a day
It depends on which tree you want to train on.
you should stop woodcutting
It depends on the average hours you spend wc'ing a day.
2 to 3 weeks or a month depends on how much u play
You keep training your woodcutting or ask a friend to do it for you.