Windows service get timeout after 15-20 min

See more:

C#4.0

I am facing problem during executing my window service...service Timeouts after 15-20 min.I am calling application URL from service and application URL has heavy data on it to process

What I have tried:

if (mode == "DAILY")
{
//Get the Scheduled Time from AppSettings.
scheduledTime = DateTime.Parse(System.Configuration.ConfigurationManager.AppSettings["ScheduledTime"]);
if (DateTime.Now > scheduledTime)
{
HttpWebRequest req = (HttpWebRequest)WebRequest.Create("http://........");
req.Timeout = 1000000;
HttpWebResponse resp = (HttpWebResponse)req.GetResponse();

//If Scheduled Time is passed set Schedule for the next day.
scheduledTime = scheduledTime.AddDays(1);
}
}