Pressing short and long buttons is an example

// Button press short-long

#define Button1 A0
#define Button2 A1
#define Button3 A2
#define Led1 A3
#define Led2 A4
#define Relay1 2
#define Relay2 3


unsigned int currentTimer1, currentTimer2;
unsigned int timeTimer1=10, timeTimer2=15;
unsigned long debounceDelay=50;    // the debounce time; increase if the output flickers
unsigned long longPressDelay=1000;
unsigned long lastDebounceTime1=0;  // the last time the output pin was toggled
unsigned long lastDebounceTime2=0;
unsigned long lastDebounceTime3=0;
unsigned long currentMillis=0, previousMillis=0;

bool readingButton1, readingButton2, readingButton3;
bool buttonShort1=false, buttonShort2=false, buttonShort3=false;
bool buttonLong1=false, buttonLong2=false, buttonLong3=false;
bool buttonShortPress1=false, buttonShortPress2=false, buttonShortPress3=false;
bool buttonLongPress1=false, buttonLongPress2=false, buttonLongPress3=false;
bool reading1=true, reading2=true, reading3=true;
bool Relay1Status=false, Relay2Status=false;
bool Led1Status=false, Led2Status=false;

void setup() {
  Serial.begin(115200);
  Serial.println("Start ...");
  pinMode (Button1, INPUT_PULLUP );
  pinMode (Button2, INPUT_PULLUP );
  pinMode (Button3, INPUT_PULLUP );
  pinMode (Led1, OUTPUT );
  pinMode (Led2, OUTPUT );
  pinMode (Relay1, OUTPUT );
  pinMode (Relay2, OUTPUT );

}

void loop() {
  currentMillis = millis();
  if (currentMillis - previousMillis >= 1000) {   // Timer every 1 second due to tick() refresh
    previousMillis = currentMillis;
    tick();
  }

  buttonCheck1();
  buttonCheck2();
  buttonCheck3();

  if (buttonShort1==true and readingButton1==HIGH){
    reading1=false;
    buttonShort1=false;
    Serial.println("Button1 Short Press");
    Led1Status=false;
    if (Relay1Status==false) {
      Relay1Status=true;
      currentTimer1=timeTimer1;
    } else {
      Relay1Status=false;
      currentTimer1=0;
    }
  }
  if (buttonLong1==true){
    reading1=false;
    buttonLong1=false;
    Serial.println("Button1 Long Press");
    Relay1Status=true;
    Led1Status=true;
    currentTimer1=0;
  }

  if (buttonShort2==true and readingButton2==HIGH){
    reading2=false;
    buttonShort2=false;
    Serial.println("Button2 Short Press");
    Led2Status=false;
    if (Relay2Status==false) {
      Relay2Status=true;
      currentTimer2=timeTimer2;
    } else {
      Relay2Status=false;
      currentTimer2=0;
    }
  }
  if (buttonLong2==true){
    reading2=false;
    buttonLong2=false;
    Serial.println("Button2 Long Press");
    Relay2Status=true;
    Led2Status=true;
    currentTimer2=0;
  }

  if (buttonShort3==true and readingButton3==HIGH){
    reading3=false;
    buttonShort3=false;
    Serial.println("Button3 Short Press");
    Led1Status=false;
    Led2Status=false;
    if (Relay1Status==Relay2Status) {
      if (Relay1Status==false) {
        Relay1Status=true;
        currentTimer1=timeTimer1;
        Relay2Status=true;
        currentTimer2=timeTimer2;
      } else {
        Relay1Status=false;
        currentTimer1=0;
        Relay2Status=false;
        currentTimer2=0;
      }
    } else {
      Relay1Status=true;
      currentTimer1=timeTimer1;
      Relay2Status=true;
      currentTimer2=timeTimer2;
    }
  }
  if (buttonLong3==true){
    reading3=false;
    buttonLong3=false;
    Serial.println("Button3 Long Press");
    Led1Status=true;
    Relay1Status=true;
    currentTimer1=0;
    Led2Status=true;
    Relay2Status=true;
    currentTimer2=0;
  }
  digitalWrite(Relay1,Relay1Status);
  digitalWrite(Relay2,Relay2Status);
  digitalWrite(Led1,Led1Status);
  digitalWrite(Led2,Led2Status);
}

void tick() {
  Serial.print(currentTimer1);
  Serial.print(" - ");
  Serial.println(currentTimer2);
  if (currentTimer1 != 0) {
    currentTimer1--;
    if (currentTimer1 == 0) {
      Relay1Status=false;
    }
  }

  if (currentTimer2 != 0) {
    currentTimer2--;
    if (currentTimer2 == 0) {
      Relay2Status=false;
    }
  }
}

void buttonCheck1() {
  readingButton1 = digitalRead(Button1);
  if (readingButton1==LOW and reading1==true) {
    if ((millis() - lastDebounceTime1) > debounceDelay) {
      buttonShort1=true;
    }
    if ((millis() - lastDebounceTime1) > longPressDelay) {
      buttonLong1=true;
      buttonShort1=false;
    }
  }
  if (readingButton1==HIGH) {
    lastDebounceTime1=millis();
    reading1=true;
  }
}

void buttonCheck2() {
  readingButton2 = digitalRead(Button2);
  if (readingButton2==LOW and reading2==true) {
    if ((millis() - lastDebounceTime2) > debounceDelay) {
      buttonShort2=true;
    }
    if ((millis() - lastDebounceTime2) > longPressDelay) {
      buttonLong2=true;
      buttonShort2=false;
    }
  }
  if (readingButton2==HIGH) {
    lastDebounceTime2=millis();
    reading2=true;
  }
}

void buttonCheck3() {
  readingButton3 = digitalRead(Button3);
  if (readingButton3==LOW and reading3==true) {
    if ((millis() - lastDebounceTime3) > debounceDelay) {
      buttonShort3=true;
    }
    if ((millis() - lastDebounceTime3) > longPressDelay) {
      buttonLong3=true;
      buttonShort3=false;
    }
  }
  if (readingButton3==HIGH) {
    lastDebounceTime3=millis();
    reading3=true;
  }
}

/*
void tmp() {
  readingButton1 = digitalRead(Button1);
    if (readingButton1==LOW ) {
      if ((millis() - lastDebounceTime1) > debounceDelay) {
        buttonShort1=true;
      }
      if ((millis() - lastDebounceTime1) > longPressDelay) {
        buttonLong1=true;
        buttonShort1=false;
      }
    } else {
      lastDebounceTime1=millis();
      if (buttonShort1==true) {
        buttonShortPress1=true;
        buttonShort1=false;
      }
      if (buttonLong1==true) {
        buttonLongPress1=true;
        buttonLong1=false;
      }
    }
  if (buttonShortPress1==true) {
    buttonShortPress1=false;
    Serial.println("Short Press");
  }
  if (buttonLongPress1==true) {
    reading1=true;
    //lastDebounceTime=millis();
    buttonLongPress1=false;
    Serial.println("Long Press");
  }
}
*/

// END