To adjust the Auto-save or Auto-recover time option, open the Office file and do the following:
Click the 'File' tab.
From the 'File' section showing up select 'Options'.
Next, under 'Word Options' dialog box's menu list, choose 'Save'.
Scroll down until you find 'Save documents' section.
There, 'Save AutoRecover information every...' option should be visible to you.
You will find by default the 'Save AutoRecover information every...' checkbox is checked.
If you want to change the time interval, just use the Up-Down arrows to change the default time and set the new time limit.