The Knowledge Consistency Checker (KCC), which manages connection objects for inter- and intrasite replication, runs every 15 minutes by default. To change this time period, start regedit and go to the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NTDS\Parameters Registry entry.
From the Edit menu, select New, DWORD Value. Enter
Repl topology update period (secs)
and press Enter. Double-click the new value, and enter the number of seconds for how often you want the KCC to run. Click OK, then close the Registry editor. Restart the machine for the change to take effect