When does an INACTIVE session disappear from V$SESSION?

I have a front end Java application server (Resin) running which connects to my Oracle DB 8.1.7.3. I notice when I query V$SESSION, the number of INACTIVE sessions is growing. Their TADDR entry is Null so no locks are placed on objects for the inactive sessions. My question is:

When does an INACTIVE session disappear from V$SESSION?

Thanks,

INACTIVE does not indicate the session is terminated. It means the user is not performing any operation at this moment.

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Originally posted by a128
When does an INACTIVE session disappear from V$SESSION?

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When the session is closed.