The value n is the number of seconds to wait between each reconnection attempt when a Data Server (ECP server) is not available. The Application Server (ECP client) continues reconnection attempts at intervals scheduled by ClientReconnectInterval until the full ClientReconnectDuration expires.
1–60 seconds. The default is 5 seconds.
On the page System Administration > Configuration > Connectivity > ECP Settings, in the This System as an ECP Application Server column, edit Time between reconnections