How quickly one's records will propagate to Openprovider DNS servers when using the latter as slave nameservers?
In general, new slave zones copy the data of the master zone file within a minute.
Changes on one's nameserver are copied automatically by Openprovider slave servers when the refresh time of the SOA record expires. Openprovider nameservers do not support the NOTIFY command to update a slave record.
In case Openprovider slave does not synchronize correctly with the master nameserver, check master's configuration.