原因：
It is possible that ntpq is trying to resolve DNS for the name of the NTP peers and that a misconfigured DNS is causing the timeout and delay of 5 minutes. You can confirm that that's the case by asking it not to resolve DNS, using the ntpq -np command (the -n flag tells it not to resolve DNS.) If that's indeed the case, you can then look into why resolving DNS for those IPs is not working (but that's a separate topic, probably deserves a specific question.)
解决办法：
ntpq -np