The scheduled moments of synchronization between the source package to iController are predefined during the set-up of your iController platform.
It is not possible to (manually) deviate from these times, except when changing the or expanding the 'Scheduled task' on the server.
Was the export written by iController? Please contact our support team with the new preferred daily hours for the export/import.
Was the export written by your own (external) IT? Please ask them to change the export hours.