What is "at long running"

Running \Run"ning\, n. The act of one who, or of that which runs; as, the running was slow.

2. That which runs or flows; the quantity of a liquid which flows in a certain time or during a certain operation; as, the first running of a still.

3. The discharge from an ulcer or other sore.

At long running, in the long run. [Obs.]
--Jer. Taylor.