How to count a page load time with selenium webdriver

Suppose their is a situation to see time taken for a web page to load.To achieve this a small piece of code is required :
Example: Situation is time taken for user to login into gmail.

package Logs;
import java.awt.AWTException;
import java.io.IOException;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
public class TrackWebtime {
public static void main(String[] args) throws IOException, AWTException{

WebDriver driver =new FirefoxDriver();

driver.get("http://www.website.com");

long start = System.currentTimeMillis();

 driver.findElement(By.id("Email")).clear();

driver.findElement(By.id("Email")).sendKeys("username");

driver.findElement(By.id("Passwd")).clear();

driver.findElement(By.id("Passwd")).sendKeys("password");

Robot robot = new Robot();

robot.keyPress(java.awt.event.KeyEvent.VK_ENTER);

long finish = System.currentTimeMillis();
 
  long TotalTime = finish - start;

System.out.println("Total Time for page load - "+TotalTime);

}
}



Output:

Total Time for page load - 4122




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