The default Webi auto-save is every 600 seconds, which is 10 minutes. You could increase it to 3600 seconds (1 hour) in CMC -> Applications > Web Intelligence > Properties > Auto-save Settings on "Auto-save time delay".
See KB 1297132 - Error: WIJ 60001 after the Web Intelligence Java Report Panel is left inactive some time on http://service.sap.com/sap/support/notes/1297132.
Hope this helps,
Jin-Chong
