Time synchronization using SNTP

Hello all,
I my trying to set up SNTP synchronization of my cRIO to NTP server. To do that, I followed instructions in: http://digital.ni.com/public.nsf/allkb/F2B057C72B537EA2862572D100646D43
When I did reboot on my cRIO, time synchronization was successful. Then I changed the clock on cRIO manually to be 2 minutes ahead of that on NTP server. In this way I wanted to test the time synchronization, but nothing happened, i.e. after 30 minutes of waiting clock on the cRIO is still 2 minutes ahead (synchronization interval is set to 5 seconds).
My question is - if I set the clock on cRIO manually to be 2 minutes ahead, will it always be 2 minutes ahead, i.e. will it be synchronized like that? Or SNTP synchronization is not working well?
If synchronization is working well (i.e. it synchronizes 2 minutes ahead because of my manual intervention), how can I test that synchronization is working well during runtime?
Also, I've read somewhere that after synchronization fails to connect with SNTP server 5 times, it won't try ever again. Is this true, and if it is how can I change this?
Best,
Marko.

UPDATE:
I did a test with 2 cRIO devices. Both of them are configured to synchronize with NTP server, and they synchronized successfully on reboot. Then I manually changed times on both of them (not long after reboot), where I set the first cRIO to be 20 seconds ahead NTP server time, and the second cRIO to be 20 seconds behind NTP server time. After 12 hours of runtime, times on both cRIO devices are still 20 seconds ahead/behind NTP server time. Time synchronization update interval was set to 10 seconds on both of them.
Now I'm confued how time synchronization works on cRIO devices. As I see it, there are two possibilites: (i) clocks were synchronized on reboot, and shortly after that I manually changed the clocks to be 20 seconds ahead/behind NTP server time - maybe cRIO now "thinks" that this is normal situation, i.e. to be 20 seconds ahead/behind; or (ii) NTP time synchronization works only on reboot.
In another thread, I read that after 5 failed attemtps to connect to the NTP server, cRIO will quit trying. I'm not sure what does this mean. If it means that cRIO will never again try to connect to the NTP server, this is not good since there is no possibility to define a backup NTP server using ni-rt.ini configuration file. If it means that the cRIO will, at each update event (in my case every 10 seconds), try to connect up to 5 times then this is OK.
If I really have a problem with "automatic" time synchronization using NTP via ni-rt.ini configuration file, would you suggest that I do this synchronization programmatically? What is the expected time synchronization accuracy in this case? Another upside of this approach is possibility of defining backup NTP servers. There are few good threads explaining how to do this: https://decibel.ni.com/content/docs/DOC-36432 , https://decibel.ni.com/content/docs/DOC-26987
I'm sorry to have so much questions, but the documentation on NI TimeSync via SNTP is very poor. All I was able to find was this: http://digital.ni.com/public.nsf/allkb/F2B057C72B537EA2862572D100646D43
Best,
Marko.

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