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V$SESS_TIME_MODEL displays the session-accumulated time for various operations.
The time reported is the total elapsed or CPU time (in microseconds). Any timed
operation will buffer at most 5 seconds of time data. Specifically, this means that if a
timed operation (such as SQL execution) takes a long period of time to perform, the
data published to this view is at most missing 5 seconds of the time accumulated for
the operation.

The time values are 8-byte integers and can therefore hold approximately 580,000
years of time before wrapping. Background process time is not included in a statistic
value unless the statistic is specifically for background processes.