According to the Book of Mormon, how long was it dark after Jesus died?

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Three days

In that day that he shall suffer death the sun shall be darkened and refuse to give his light unto you; and also the moon and the stars; and there shall be no light upon the face of this land, even from the time that he shall suffer death, for the space of three days. Helaman 14:20

Darkness should cover the face of the whole earth for the space of three days. Helaman 14:27

It came to pass that it did last for the space of three days that there was no light seen. 3 Nephi 8:23