If you need a timer circuit, we go after the most proven 555th However, if the delays are longer, based on timing capacitor capacity is too large. In this case, a circuit of Figure 1 After pressing the button - reset circuit - starts multivibrator.
It vibrates so long to fill the output Q14 of the counter and moves to the level of H. multivibrator to produce pulses 8192 (2 13 ). Through the diode is then locked oscillator and a timer waiting for the next reset. Everything is clear from the timing diagram.