rdisp/bgrfc_watchdog_time is a SAP Parameter attribute which is used to control Specifies the time cycle for the bgRFC watchdog 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 .
The bgRfc Watchdog is an ABAP program (RS_BGRFC_SCHEDULER_STARTUP) that
monitors the bgRfc scheduler. This program is executed periodically. You
can use this parameter to configure the frequency of the program's
execution. The value 0 deactivates the Watchdog.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.