Расскажите потом, что они (кто бы это ни был) вам напишут про это.
With respect to your question, we would like to inform you as follows.
You can stay for a maximum of 8 months outside the Netherlands. Please note that the basic rule is that you can stay outside the Netherlands for maximum 4 months in a row for 3 calendar years in a row. If you stay more then 8 months outside the Netherlands, please note that this could have risks for your resident permit and for tax purposes. The authorities could have the opinion that your main residence has been moved to the foreign country, which means that your resident permit will be revoked or not be extended.
Please also note that if you stay outside the Netherlands for more then 4 months, we should notify the IND.