Hello. Vayikra 3:17 חקת עולם לדרתיכם בכל מושבתיכם כל חלב וכל דם לא תאכלו׃ How long does this(Olam) mean? I want to know the temporal length of this word.

It is forever, that even though the previous verses dealt with sacrifices, and you may have mistakenly thought that the prohibition on eating blood and the non-kosher fats is only in the Temple regarding those sacrifices, comes the Torah to detail that these prohibitions are in all times (even today when there is no Temple in Jerusalem) and even in all places (b'chol moshvoteichem) and all meats.