I have my first two prototypes that are functioning and working well. The way I have configured the circuit you press the button and the LEDs stay on for about 43s (if the resistor and capacitor were perfect). You can of course make it longer with a larger resistor or capacitor in the timing circuit.

The main issue with the last iteration is that the footprint for the push button switch was done wrong so that the trigger pin was always pulled low causing the circuit to always be triggered.

Enjoy the demo video below: