Saving a document
There are three ways to save a document in Writer:
You also can tell Writer to save your document automatically at regular intervals. To enable this, you must configure OpenOffice.org to save all documents automatically.
Select Tools > Options. The Options window appears.
Select Load/Save > General.
Click on AutoSave every. This enables the box to set the interval. The default value is 15 minutes. Enter the value you want by typing it or by pressing the up or down arrow keys.