Is it permissible to perform the sunnah of Dhuha twenty minutes before the Zuhr prayer?

Question:
Is it permissible to perform the sunnah of Dhuha twenty minutes before the Zuhr prayer, knowing that I do not pray it, and that is because I am occupied with household chores, and sometimes I go to the hospital and I am delayed, so what do you advise me to do? May Allah reward you with good.

Answer:
The end of the time for the Dhuha prayer is not the Zuhr prayer, because the Zuhr prayer may be performed early or late; rather, its end is determined by the disappearance of the sun, or, more correctly, by the sun standing in the middle of the sky. When the sun is level with the heads, the time for the Dhuha prayer ends at that point.
So its end is when the sun is in the middle of the sky, level with the heads, such that there is no shadow, but the shadow shrinks at this time. This is a time of prohibition, a prohibition from praying in it, and what comes before it is the time for the Dhuha prayer, starting from the sun rising a spear's length until it is in the middle of the sky, as we mentioned.