65b2f968_R_12000_Series_Router____Cisco_ase_verbose_Field_Descriptions_Description
[Field] LSP Holdtime [Description] 
Time the LSP remains valid (in seconds). An LSP hold time of zero indicates that this LSP was purged and is being removed from the link-state database (LSDB) of all routers. The value indicates how long the purged LSP stays in the LSDB before being completely removed.
Cisco IOS XR Routing Command Reference for the Cisco XR 12000 Series Router, Release 4.2.x - IS-IS Commands on Cisco IOS XR Software [Cisco XR 12000 Series Router] - Cisco