If you are using a dragon axe and you were playing nonstop maybe 2 days.
It takes a week and a day (source) 99 Woodcutting :D
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.
It depends on which tree you want to train on.
That depends. In a populated world trees will respawn every 2 minutes or so. If you are woodcutting near the mage training area, it will take about 6 minutes. If you farm a magic tree, you can use the hydra to spawn the magic tree instantly each time it is depleted. dont forget you get a boost with your 99 woodcutting cape. gnome tree stronghold is a great place to cut magics.
about 10 hours :(
I am considering getting the trees in my yard trimmed. I have two small trees would they take very long to be trimmed?
It won't work. You will be caught, and your account will be banned.
Depends on your Woodcutting level, what axe you are using and how long you play per day.
This entirely depends on what level you are starting at and what you are using to train the skill.
513 Hours Mostly like 2-3weeks
This depends on alot of things, Your woodcutting level, If you are going to buy or cut them, How long you play Where you are cutting them, But usually it would take about 2 days to get 2k magic logs
like a week if u play for 2-3 hours a day