#include <Arduino.h>
#include <Bounce2.h> // https://github.com/thomasfredericks/Bounce2/archive/refs/heads/master.zip

Bounce2::Button button = Bounce2::Button();

const int buttonPin = 4;
const int ledPin = 10;

const int blinktime = 60; // Seconds
const int blinkPerSecond = 8;
const int blinkPerTime = blinktime * blinkPerSecond;
const int blinkInteval = (blinktime * 1000UL) / blinkPerTime;

unsigned long prevMicros = 0;
unsigned long stepMicros = 0;

bool startBlink = false;
bool ledState = false;

void setup()
{
  pinMode(ledPin, OUTPUT);

  button.attach(buttonPin, INPUT_PULLUP);
  button.interval(5); // interval im ms
  button.setPressedState(LOW);
}

void loop()
{
  if (startBlink == false)
  {
    button.update();

    if (button.pressed())
    {
      startBlink = true;
      prevMicros = micros();
    }
  }

  if (((micros() - prevMicros) <= (blinktime * 1000UL * 1000UL)) && (startBlink == true))
  {
    if ((micros() - stepMicros) >= ((blinkInteval * 1000UL) / 2))
    {
      ledState = !ledState;
      digitalWrite(ledPin, ledState);

      stepMicros = micros();
    }
  }
  else
  {
    digitalWrite(ledPin, LOW);
    startBlink = false;
  }
}