Ok I think I got it now.
You activate the node on a single frame. The interpolation will run for as much seconds as you set, and in the end the Vector that is being put out is the same as the “End Vector”.
For the Vector to arrive at its destination at the right time the “Starting-” and “End Vector” need to stay the same throughout the whole time the node is supposed to run. I tried to achieve this in-node, but I couldn’t get it to work. So if the Vector is changing, you need to lock it it place when the node is started, like it is done with the three bottom-most nodes in this setup. In this case the vector changes because it is the location of “Cylinder”, which is being altered with the “Set Location” node in the end.
If you want abort the interpolation and reuse the node (Press “Space” again in this case) you need to set “Stop Interpolation” for (at least) one frame to true. This resets the timer and the output-Vector.
The node is now available in logic_pack.