In 800xA event list
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With factory default settings; 10.000 events PER CATEGORY is stored by the Event Storage service.
At an event flow of 1 event (of the same category) every 10 seconds, storage will wrap after approximately one day only.
I suggest creating an event list filter which includes only one event category, eg Process Condition Event (the AC800'sprocess alarm category) - at full default storage capacity you shall be able to push "Next page" 19 times before reaching the "event list tail".
Storage may be increased to 50.000 events per category; refer to the product documentation.
An IM message log may store up to 12.000.000 events; but is best searched using a SQL client.