SNTP timeout after 15 seconds but default is supposed to be 68 sec Using sntp to query an NTP server times out after just 15 sec. 

Stevens-MacBook-Air:~ Steve$ sntp -d time.nist.gov
Starting to read KoD file /var/db/ntp-kod...
sntp sendpkt: Sending packet to 2610:20:6f15:15::27... Packet sent.
sntp recvdata: select() reached timeout (15 sec), aborting.
sntp recvpkt failed: -1.
Server unusable
on_wire failed for server 2610:20:6f15:15::27!
sntp sendpkt: Sending packet to 216.229.0.179... Packet sent.
sntp recvdata: select() reached timeout (15 sec), aborting.
sntp recvpkt failed: -1.
Server unusable
on_wire failed for server 216.229.0.179!


According to sntp documentation and man page for sntp, default is supposed to be 68 seconds. Is this a bug sntp installed in OS 10.11.6?
Apple's manual page says the default is 5 seconds, but I'm seeing the same 15 second timeout as you in practice. I'd file a bug against the documentation to make it match (if you want) and then specify the timeout you want on macOS:

sntp --timeout 68 -d time.nist.gov