rdisp/max_vm_priv_time is a SAP Parameter attribute which is used to control 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 .
If a session of the VMC (Virtual Machine Container) exceeds a certain
size, then it is stored in the VM local memory. This means that the VM
can no longer be used for other users. This means that this parameter
can be used to restrict the time that that the VM spends in this state.
If it is exceeded then the VMC can reset the session and restart the VM.
Also see parameter
See SAP Parameter Documentation for full SAP documentation for this profile parameter.