That's reasonable, as there is presumably something else effectively connected across points 2,3. So, at your own risk, you could try temporarily connecting 10k between 2 and 4 (probably easier than between 2 and 3). In theory that should roughly halve the over-run time and you can work down from there with a lower value resistor. Unless you can post the full schematic of the control circuit, suck it and see seems the only approach.
But BE CAREFUL. Ensure mains power has been off for at least 30 secs before working on the circuit.