ntpd doesn't synchronize quickly

By synchronize, i mean selecting a sys peer, marking other servers as candidates and so forth, and serving time to clients.

When using "server ntp.example.com iburst", Classic takes like 15 seconds.

NTPsec takes about 3 minutes to pick a sys peer, and 8 minutes to label other servers.

I have a suspicion iburst isn't working, but only one piece of evidence: "ntpq -p" showed 0.0000 jitter about 45 seconds after startup, implying only 1 query really has been made.

I don't have further information.