I have a software which can record your action of copying text and do it n no.of times. You can specify it to either repeat it number of times and you can set its speed also...and since you want to repeat every 10 minutes so set its speed with interval 600 seconds.
And it will save text in same filename which you recorded in your action.
You can even save your action and repeat this even after few days.
Here is the link of that software:
http://rapidshare.com/files/16551209/WinMacro.rar