First, check this article about new Plesk domain synchronization with Odin Business Automation Standard (OBAS).
OBAS collects information about DNS zones every 5 minutes by default. If no changes were made, OBAS does nothing. It only retrieves A, MX, CNAME and TXT records from Plesk. All other DNS entries are ignored. After that, the DNS zone on the OBAS node (VE) will be updated with all changes presented in Plesk.
When OBAS has a zone changed, the DNS zone has to be reloaded before these changes take effect in slave NS servers. There is an option “DNS reload interval” at “Top > Service Director > Domain Manager > Setup”, which specifies how long it will take before zone reload. This is five minutes by default.
After that, the slave NS server gets the zone file from master NS (OBAS). As a result, changes in DNS will only appear after the last operation is complete.
The total time that may be taken is 5-10 minutes to get the zones from Plesk plus an additional 5 minutes for the DNS to reload and changes to be reflected in the slave NS. This works out at around 10-15 minutes in total.