While loop with specific time to wait until element get displayed in selenium C# and java

 public static void waitForOneTrust()

        {

            var stopwatch = new Stopwatch();

            stopwatch.Start();

            while (stopwatch.Elapsed < TimeSpan.FromSeconds(30))

            {

                IWebElement oneTrust = driver.FindElement(By.Id("onetrust-accept-btn-handler"));

                if (oneTrust.Displayed)

                {

                    break;

                }

            }

        }

In Java:

public void waitTillBackOfficePageLoad()
{
    LocalDateTime now = LocalDateTime.now();
    while (LocalDateTime.now().isBefore(now.plusSeconds(30)))
    {

        if(xxxxxx)
        {
            break;
        }

    }
}