This setting applies to both L2 and L3 topology pollers. It is stored on per node basis in NodeSettings table. Setting name is "Core.TopologyPollInterval". You just need to create a new row with matching NodeID, SettingName and Value (in minutes).
There is also a Orion-wide setting available in Settings table with SettingID "SWNetPerfMon-Settings-Default Node Topology Poll Interval". It might be also edited in GUI on Polling Setting page and it applies to all nodes, which have no custom "Core.TopologyPollInterval" specified in NodeSettings table.