rdisp/shutdown/auto_logout is a SAP Parameter attribute which is used to control Max. lazy time for online and HTTP user 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 dialog users can be inactive for during
the kernel shutdown before they are automatically logged out. If you
specify a value > 0, the maximum waiting time is calculated from the
minimum values of parameters rdisp/gui_auto_logout and
rdisp/shutdown/auto_logout.
The value 0 means that a timeout is not triggered when waiting.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.