The code usually arrives in under a minute. Check that the number entered is yours (05, 06 or 07, 10 digits) and that your phone receives SMS.
You can request a new code after 30 seconds: 3 sends at most in 10 minutes, 5 per hour and 10 per day. After 5 wrong codes, wait 15 minutes.
Each code expires after 10 minutes. Never share it: Chghol will never ask you for it by phone.