rdisp/bufreftime is a SAP Parameter attribute which is used to control Refresh Interval in Distributed Systems 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 local buffers are updated to the latest state every <(><<)>n>
seconds (you can define the unit, see below) by reading and processing
the new DDLOG records. The buffer synchronization must be activated
(parameter
See SAP Parameter Documentation for full SAP documentation for this profile parameter.