rdisp/max_cmdrun_time is a SAP Parameter attribute which is used to control Maximum command run time 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 limits the runtime of individual commands, such as SQL
statements in background processing, update, and spool processes. If the
parameter is set, the process is terminated if the CPU time has not
changed after a timeout. A value of 0 deactivates the limit.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.