The AutoSave (also known as AutoRecovery) options can be found in two locations: under org.openoffice.Office.Recovery/AutoSave and under org.openoffice.Office.Common/Save/Document. The settings in org.openoffice.Office.Common are not used and are ignored by OpenOffice. Nonetheless, to be safe, it is recommended to set the options in both locations.
For example, to change the the AutoSave interval from 15 minutes to 5 minutes:
In org.openoffice.Office.Recovery/AutoSave
set TimeIntervall to 5
In org.openoffice.Office.Common/Save/Document
set AutoSaveTimeIntervall to 5