Originally Posted by
xsithspawnx
Current versions of this and several other EDU altering sub-mods are now directly included with RS2.5.
Go to your RS2.5 data folder and then to the Important Stuff folder. There you should see a folder called "EDU changes", and therein are multiple altered EDU's, changing both battle length and unit cost.
Select the one that fits your liking and copy and paste the contents of the folder into your main RS2 directory (the one with the rtw exe in it). To return it to normal just select the default folder in EDU changes and do the same thing.