On the Word Start screen, click on 'Options' in the list on the left.
In the Word Options dialog box, click 'Save' in the list on the left.
In the 'Save documents' section of the 'Save' screen , make sure the 'Save AutoRecover information' option is checked. Change the minutes (minutes) by entering a new number or using the up / down arrows to change the value.
Click 'OK' to save the changes.
If you do not want Word to automatically save the document you are editing, uncheck the check box next to 'Save AutoRecover information every'.