rdisp/shutdown/load_balance_wait_time is a SAP Parameter attribute which is used to control Max. wait time for load balance refresh during shutdown information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
This parameter defines how long the kernel waits at shutdown for the
sever to be deleted from the load balancing information. In this time,
all requests can continue to be processed.
The value 0 means that a timeout is not triggered when waiting.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.