Detect a range of variables for 3 seconds

Unity Engine
,
2

Please use code tags .

You could just sum up the delta times when the condition is true. Something like:

private float timesum;
private void Update()
{
    if (Data <1000 && Data > 800)
    {
        timesum += Time.deltaTime;
    }
    else
    {
        timesum = 0.0f;    // reset the timer when condition is no longer true
    }
    if(timesum >= 3.0f)
    {
        // your logic here
    }
}

Edit: Messed up.