SNTP server information

Hi all. bit of a niche question.
I run video systems on theatre shows (Disguise/D3) our machines run windows. One of the issues we have is after several months the time on the computers drifts given they’re off the web. 

I noticed the EOS consoles have an inbuilt NTP server option which may be useful as our D3s sit on the LX network. 
I attempted to set the EOS NTP server IP in windows but had no luck. When I use an NTP test tool on my MacBook I also get no response from the EOS. Does anyone have any technical info on the NTP server details or success stories of synchronising to an EOS NTP time server?

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