Length of time jobs stay in online database

Q:

How long do jobs stay in the ISPF JSF online database before purged to a backup file?

A:

That is determined by the KEEPDAYS parameter in your JSFIOP options module, and by how often your purge job is run.  When the purge job runs, it archives jobs that are more than KEEPDAYS old from the online JSF Job History PDS or PDSE to a backup GDG file.