rdisp/autothtime is a SAP Parameter attribute which is used to control Time cycle for periodical taskhandler checks 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 .
rdisp/autothtime defines the time interval for the checks performed
periodically in the taskhandler. These include
The automatic resetting of the trace files
Auto-logout for external plug-ins (HTTP, and so on)
See SAP Parameter Documentation for full SAP documentation for this profile parameter.