What is the explanation of the number of days of 'Id al-Adha and hastening for the pilgrim during them?

Question:
And another sent us a question in poor handwriting, and we are trying to read it despite its defects. He says: On the day I heard a speaker on the day of 'Arafah say that the festival is four days, like the number of stonings, that the stonings are four days, so he said the festival is four days likewise. And he heard him say that whoever hastens, he stons four with one stone on the twelfth day along with the eleventh, meaning he stons on the eleventh day and then stons on the twelfth day. I do not know, meaning...

Answer:
This is reasonable speech. It means that the days of the festival are the days of slaughter. The days of the festival are called four: the day of the festival and the three days following it. All of them involve stoning. On the day of the festival, one stones the large pillar. On the eleventh, one stones the three pillars. On the twelfth, one stones the three pillars. And likewise, on the thirteenth, for those who do not hasten, one stones the three pillars. So all of them are days of the festival, all are days of stoning, all are days of slaughter, and all are days of eating and drinking to remember Allah (Mighty and Majestic). If one stones on the day of the festival, and stones the three pillars on the eleventh after the sun has passed its zenith, and stones the three pillars on the twelfth after the sun has passed its zenith, then he may hasten before the sun sets. He may hasten and return to Makkah before the sun sets. And if he wishes to return to his home, there is no harm in that. He may hasten and he owes nothing. And if he stays the night of the thirteenth and stones on the thirteenth, that is better, because the Messenger (peace and blessings be upon him) stayed the night and stoned on the thirteenth. This is the best, as it involves following the action and imitating the Prophet (peace and blessings be upon him). And if he hastens after the sun has passed its zenith and after stoning on the twelfth, there is no harm in that. He may stay in Makkah as long as he wishes. When he intends to travel, he performs the farewell tawaf after that. And if he hastens immediately and travels after the farewell tawaf, after having stoned on the twelfth, passing through Makkah and performing the farewell tawaf, and then walks and travels, there is no harm. But some people may be misled and count the day of the festival as the first of the days of Tashriq. If he stones on the eleventh and hastens, that is a mistake. The day of the festival is not one of the days of Tashriq. Abu al-Zumar, in his statement regarding the words of the Exalted, what is among the people , these days are other than the day of the festival, like the eleventh, twelfth, and thirteenth. So hastening in two days means on the twelfth. And the day of the festival, the day of the festival is not counted among them. This should be understood. The three days are the eleventh, twelfth, and thirteenth. Hastening is on the twelfth, and delaying is until the thirteenth. It is not permissible to stone except after the sun has passed its zenith on these three days. All of it is after the sun has passed its zenith. Hastening is after stoning the pillars and after the sun has passed its zenith. He stones them after the sun has passed its zenith, then hastens to Makkah to perform tawaf, then travels when he wishes. And if he remains in Makkah, he remains until he intends to travel. When he intends to travel, he performs tawaf with this matter.