See in draft-ietf-ipp-model-v11-02, section 4.4.31,
"multiple-operation-time-out (integer(1:MAX))":
This Printer attributes identifies the minimum time (in seconds)
that the Printer object waits for additional Send-Document or Send-URI
operations to follow a still-open multi-document Job object before
taking any recovery actions, such as the ones indicated in section
3.3.1. If the Printer object supports the Create-Job and Send-Document
operations (see section 3.2.4 and 3.3.1), it MUST support this
attribute.
It is RECOMMENDED that vendors supply a value for this attribute that
is between 60 and 240 seconds. An implementation MAY allow a system
administrator to set this attribute (by means outside this IPP/1.1
document). If so, the system administrator MAY be able to set values
outside this range.
-Carl