Annoying - something seems to have lost my last post. Anyway, I said much the same thing.
74HCT4060 (or similar). Set it up with RC timing, to clock at 0.5Hz or so. Add a RC network from VCC to MR to ensure that when the supply comes up it resets cleanly (say 10uF and 10K). Add a diode from RS to bit 14 - so that when bit 14 goes high, it stops the clock. And from the same pin, a resistor, to an NPN transistor to drive the relay.