This is the number of seconds to delay in the 'waiting' state before entering the 'on' state, following the resettingTimer behavior. It is essentially a startup stabilization delay that holds the IS-IS process in waiting (letting interfaces and configuration settle) before it fully activates and begins forming adjacencies, so a very short value could cause the process to come up and start advertising before its own local state is fully ready. For example, setting ciiSysWaitTime to 20 seconds after a router reload gives interfaces and area configuration a 20-second grace period to stabilize before IS-IS transitions to fully on and starts sending Hellos.