need it to work when the button is press and held.
How fast do you want the counter to decrement ?
if (buttonPushCounter ==-1){
lcd.setCursor(0,1);
lcd.print("29 LEFT");
}
if (buttonPushCounter ==-2){
lcd.setCursor(0,1);
lcd.print("28 LEFT");
}
If you look carefully you will see that there is a fixed relationship between the value of buttonPushCounter and the number you print. I hope that you realise that you can print numbers, not just text, on the LCD.