in example properly wait for NTP to be set (#4000)

fix #3905

libraries/ESP8266WiFi/examples/HTTPSRequestCACert/HTTPSRequestCACert.ino

@@ -53,7 +53,7 @@ void setup() {
   Serial.print("Setting time using SNTP");
   configTime(8 * 3600, 0, "pool.ntp.org", "time.nist.gov");
   time_t now = time(nullptr);
-  while (now < 1000) {
+  while (now < 8 * 3600 * 2) {
     delay(500);
     Serial.print(".");
     now = time(nullptr);