DirecTV DIRECT TV Manual page 119

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• You can tell the Receiver how long you want to keep recordings. By default, all
programs except Pay Per View events are kept for at least two days. After that,
programs may be deleted to make room for other recordings you request.
Recordings of Pay Per View events are kept until you delete them. TiVo uses this
information to figure out not only what space will be available, but also when it
will become available. If enough space will not be available, TiVo tells you which
programs it would delete to make more room. However, you always have the final
say on how long the Receiver keeps recorded programs. You can delete programs
at any time and can always change how long a program is saved by changing the
"Save Until..." option described on page 41.