So sometimes its really handy to see how long it is before your skill is ready for use.
I have found this mod which I use and works well.
Firstly backup your L2_skilltime.utx file. This is located in \SysTextures\L2_skilltime.utx
Then replace it with the file below and you will have the % skill re-use showing.
https://app.box.com/v/L2Shrine
Enjoy