The days have been shorten for the sake of the elect.

Also, from the book of Enoch chapter 80:

 Perversion of Nature and the heavenly Bodies owning to the Sin of Men.

2. And in the days of the sinners the years shall be shortened,
And their seed shall be tardy on their lands and fields,
And all things on the earth shall alter, p. 107
And shall not appear in their time:
And the rain shall be kept back
And the heaven shall withhold (it).3. And in those times the fruits of the earth shall be backward,
And shall not grow in their time,
And the fruits of the trees shall be withheld in their time.

4. And the moon shall alter her order,
And not appear at her time.
5. [And in those days the sun shall be seen and he shall journey in the evening †on the extremity of the great chariot† in the west]
And shall shine more brightly than accords with the order of light.

6. And many chiefs of the stars shall transgress the order (prescribed).
And these shall alter their orbits and tasks,
And not appear at the seasons prescribed to them.

7. And the whole order of the stars shall be concealed from the sinners,
And the thoughts of those on the earth shall err concerning them,
[And they shall be altered from all their ways],
Yea, they shall err and take them to be gods.

8. And evil shall be multiplied upon them,
And punishment shall come upon them So as to destroy all.’

The above from Enoch is in complete agreement with Luke 21:

²⁵ And there shall be signs in the sun, and in the moon, and in the stars; and upon the earth distress of nations, with perplexity; the sea and the waves roaring;

²⁶ Men’s hearts failing them for fear, and for looking after those things which are coming on the earth: for the powers of heaven shall be shaken.