The amount of time required for the bak restoreftfamily command to complete depends on the number of filesets to be restored. However, a restore operation that includes a large number of filesets can take hours to complete. To reduce the amount of time required for the operation, you can execute multiple instances of the command simultaneously, specifying disjoint fileset families with each command if you use the -family option, or indicating files that list different filesets with each command if you use the -file option. Depending on how the filesets to be restored were dumped to tape, specify disjoint fileset families can also enable you to make the most efficient use of you backup tapes when many filesets need to be restored.