Limiting Persistent Authentication Cookie Lifetime

void Application_EndRequest(Object sender, EventArgs e)
{
    // Change the expiration date on outgoing persistent forms
    // authentication tickets to 24 hours hence.
    HttpCookie cookie1 = GetCookieFromResponse(
        FormsAuthentication.FormsCookieName);

    if (cookie1 != null && !String.IsNullOrEmpty (cookie1.Value))
    {
        FormsAuthenticationTicket ticket1 = FormsAuthentication.Decrypt(
            Response.Cookies[FormsAuthentication.FormsCookieName].Value);
        if (ticket1.IsPersistent)
        {
            FormsAuthenticationTicket ticket2 =
                new FormsAuthenticationTicket (
                ticket1.Version, ticket1.Name, ticket1.IssueDate,
                DateTime.Now.AddHours (24), // New expiration date
                ticket1.IsPersistent, ticket1.UserData,
                ticket1.CookiePath
            );

            Response.Cookies.Remove(FormsAuthentication.FormsCookieName);
            HttpCookie cookie2 = new HttpCookie(
                FormsAuthentication.FormsCookieName,
                FormsAuthentication.Encrypt(ticket2));
            cookie2.Expires = ticket2.Expiration;
            Response.Cookies.Add(cookie2);
        }
    }
}

HttpCookie GetCookieFromResponse (string name)
{
    HttpCookieCollection cookies =
        HttpContext.Current.Response.Cookies;
    int count = cookies.Count;
    for (int i=0; i<count; i++) {
        if (String.Compare (cookies[i].Name, name, true) == 0)
            return cookies[i];
    }
    return null;
}