Node for Longest Path

I have been going through most of node repository for a node that can return me longest path. I do have a network that's complex. I want to find the longest path within the network. I found out there is only "shortest path" node. How to find out longest path?

Can anyone please help me? I am in dire need of a solution!

Finding the longest path is an NP hard problem. For the network in your picture it very likely impossible to find the longest path. Therefore there also isn't a node for this.