SynScan starts the clock at power on with a default time of 8:00:00 pm (I've never seen an option to change that).
At the point where you press Enter to enter the current time, the time is updated and the clock continues to run - pretty much like updating any digital clock. As far as I can determine, the delay between hitting Enter and the time being "latched" by the handset is less than half a second.
I spent a 6-hour session frequently checking time and it was never wrong (within half a second).
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