Help me please!! How Activate a motor for a fixed amount of time?

How can I order to my stepper motor just vehicle 5 seconds clockwise and anti-clockwise 5 seconds ?

int motorPin1 = 8; // Blue - 28BYJ48 pin 1
int motorPin2 = 9; // Pink - 28BYJ48 pin 2
int motorPin3 = 10; // Yellow - 28BYJ48 pin 3
int motorPin4 = 11; // Orange - 28BYJ48 pin 4
// Red - 28BYJ48 pin 5 (VCC)

int motorSpeed = 0; //variable to set stepper speed
int sensorValue = 0; //potentiometer connected to A0
long int currentMillis;

//////////////////////////////////////////////////////////////////////////////
void setup() {
//declare the motor pins as outputs
pinMode(motorPin1, OUTPUT);
pinMode(motorPin2, OUTPUT);
pinMode(motorPin3, OUTPUT);
pinMode(motorPin4, OUTPUT);
Serial.begin(9600);
}

//////////////////////////////////////////////////////////////////////////////
void loop(){

sensorValue = analogRead(A0); // read the value of the potentiometer
Serial.println(sensorValue); // View full range from 0 - 1024 in Serial Monitor
if (sensorValue < 535){ // if potentiometer reads 0 to 535 do this
motorSpeed = (1); //scale potValue to be useful for motor

clockwise(); //go to the ccw rotation function
delay(0);

}
else { //value of the potentiometer is 512 - 1024
motorSpeed = (1); //scale potValue for motor speed
counterclockwise(); //go the the cw rotation function
delay(0);
}
}

This guy has a very similar problem

   clockwise();                     //go to the ccw rotation function
counterclockwise(); //go the the cw rotation function

I prefer it when the comments match the code. I prefer it even more when I can see all the code.

As to your question. Have a look at the BlinkWithoutDelay example to see how to use millis() for timing.

Please post all of your code so that we can give more advice. When you do please use code tags.

//declare variables for the motor pins
int motorPin1 = 8; // Blue - 28BYJ48 pin 1
int motorPin2 = 9; // Pink - 28BYJ48 pin 2
int motorPin3 = 10; // Yellow - 28BYJ48 pin 3
int motorPin4 = 11; // Orange - 28BYJ48 pin 4
// Red - 28BYJ48 pin 5 (VCC)

int motorSpeed = 0; //variable to set stepper speed
int sensorValue = 0; //potentiometer connected to A0
long int currentMillis;

boolean motorRunning = false;
unsigned long motorStartMillis;
unsigned long motorRunMillis = 180000;

//////////////////////////////////////////////////////////////////////////////
void setup() {
//declare the motor pins as outputs
pinMode(motorPin1, OUTPUT);
pinMode(motorPin2, OUTPUT);
pinMode(motorPin3, OUTPUT);
pinMode(motorPin4, OUTPUT);
Serial.begin(9600);
}

//////////////////////////////////////////////////////////////////////////////
void loop(){

sensorValue = analogRead(A0); // read the value of the potentiometer
Serial.println(sensorValue); // View full range from 0 - 1024 in Serial Monitor
if (sensorValue < 300){ // if potentiometer reads 0 to 535 do this
motorSpeed = (1); //scale potValue to be useful for motor

clockwise(); //go to the ccw rotation function
delay(0);
}

if (sensorValue > 700){ // if potentiometer reads 0 to 535 do this
motorSpeed = (1); //scale potValue to be useful for motor

clockwise(); //go to the ccw rotation function
delay(0);
}

else { //value of the potentiometer is 512 - 1024
motorSpeed = (1); //scale potValue for motor speed
counterclockwise(); //go the the cw rotation function
delay(0);
}

}

//////////////////////////////////////////////////////////////////////////////
//set pins to ULN2003 high in sequence from 1 to 4
//delay “motorSpeed” between each pin setting (to determine speed)

void counterclockwise (){
// 1
digitalWrite(motorPin1, HIGH);
digitalWrite(motorPin2, LOW);
digitalWrite(motorPin3, LOW);
digitalWrite(motorPin4, LOW);
delay(motorSpeed);
// 2
digitalWrite(motorPin1, HIGH);
digitalWrite(motorPin2, HIGH);
digitalWrite(motorPin3, LOW);
digitalWrite(motorPin4, LOW);
delay (motorSpeed);
// 3
digitalWrite(motorPin1, LOW);
digitalWrite(motorPin2, HIGH);
digitalWrite(motorPin3, LOW);
digitalWrite(motorPin4, LOW);
delay(motorSpeed);
// 4
digitalWrite(motorPin1, LOW);
digitalWrite(motorPin2, HIGH);
digitalWrite(motorPin3, HIGH);
digitalWrite(motorPin4, LOW);
delay(motorSpeed);
// 5
digitalWrite(motorPin1, LOW);
digitalWrite(motorPin2, LOW);
digitalWrite(motorPin3, HIGH);
digitalWrite(motorPin4, LOW);
delay(motorSpeed);
// 6
digitalWrite(motorPin1, LOW);
digitalWrite(motorPin2, LOW);
digitalWrite(motorPin3, HIGH);
digitalWrite(motorPin4, HIGH);
delay (motorSpeed);
// 7
digitalWrite(motorPin1, LOW);
digitalWrite(motorPin2, LOW);
digitalWrite(motorPin3, LOW);
digitalWrite(motorPin4, HIGH);
delay(motorSpeed);
// 8
digitalWrite(motorPin1, HIGH);
digitalWrite(motorPin2, LOW);
digitalWrite(motorPin3, LOW);
digitalWrite(motorPin4, HIGH);
delay(motorSpeed);

}

//////////////////////////////////////////////////////////////////////////////
//set pins to ULN2003 high in sequence from 4 to 1
//delay “motorSpeed” between each pin setting (to determine speed)

void clockwise(){
// 1
digitalWrite(motorPin4, HIGH);
digitalWrite(motorPin3, LOW);
digitalWrite(motorPin2, LOW);
digitalWrite(motorPin1, LOW);
delay(motorSpeed);
// 2
digitalWrite(motorPin4, HIGH);
digitalWrite(motorPin3, HIGH);
digitalWrite(motorPin2, LOW);
digitalWrite(motorPin1, LOW);
delay (motorSpeed);
// 3
digitalWrite(motorPin4, LOW);
digitalWrite(motorPin3, HIGH);
digitalWrite(motorPin2, LOW);
digitalWrite(motorPin1, LOW);
delay(motorSpeed);
// 4
digitalWrite(motorPin4, LOW);
digitalWrite(motorPin3, HIGH);
digitalWrite(motorPin2, HIGH);
digitalWrite(motorPin1, LOW);
delay(motorSpeed);
// 5
digitalWrite(motorPin4, LOW);
digitalWrite(motorPin3, LOW);
digitalWrite(motorPin2, HIGH);
digitalWrite(motorPin1, LOW);
delay(motorSpeed);
// 6
digitalWrite(motorPin4, LOW);
digitalWrite(motorPin3, LOW);
digitalWrite(motorPin2, HIGH);
digitalWrite(motorPin1, HIGH);
delay (motorSpeed);
// 7
digitalWrite(motorPin4, LOW);
digitalWrite(motorPin3, LOW);
digitalWrite(motorPin2, LOW);
digitalWrite(motorPin1, HIGH);
delay(motorSpeed);
// 8
digitalWrite(motorPin4, HIGH);
digitalWrite(motorPin3, LOW);
digitalWrite(motorPin2, LOW);
digitalWrite(motorPin1, HIGH);
delay(motorSpeed);
}

And the code tags?
What is the code doing?
What is the code not doing?
How do those things differ from your expectations?

// This Arduino example demonstrates bidirectional operation of a
// 28BYJ-48, which is readily available on eBay, using a ULN2003
// interface board to drive the stepper. The 28BYJ-48 motor is a 4-
// phase, 8-beat motor, geared down by a factor of 68. One bipolar
// winding is on motor pins 1 & 3 and the other on motor pins 2 & 4.
// Refer to the manufacturer's documentation of Changzhou Fulling
// Motor Co., Ltd., among others. The step angle is 5.625/64 and the
// operating Frequency is 100pps. Current draw is 92mA. In this
// example, the speed and direction of the stepper motor is determined
// by adjusting a Photoresistor to Arduino pin A0.
// When thesensor is 800 counterclockwise, the motor
// will rotate at full counterclockwise speed. As the sensor is
// rotated clockwise,

////////////////////////////////////////////////