OTB, configAudit.xml is set to record only:
- Login
- Two other events: "Logout" (no activity after allotted time) and "Context Login" (access a certain Product / Library, etc.)
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wt.session.SessionUserAuditEvent/login
This info is stored in the database AUDITRECORD table
From Site, Utilities, Security Audit Reporting, this info is available to query and report on- but only if you have not purged the records using the Audit Log Purge Manager function (purging removes (and optionally stores in a zip file) all records for a time period).
It's also possible to query the database directly - which allows this to be scripted and automated. One sample:
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If it's desired to see exactly when a user logged on, one can manipulate the date output to include Hours, Minutes, Seconds.
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Note that this also lends itself to analysis (possibly in Excel) to determine the number of concurrent users over time - no other way that we're aware of.