English Translation of Hadith
Hazrat Abu Hurairah (May Allah be pleased with him) reported: The Messenger of Allah [SAWW](PBUH) took hold of my hand and said, "Allah, the Exalted and Glorious, created the earth on Saturday, the mountains on Sunday, the trees on Monday, the things entailing labour on Tuesday, light on Wednesday, He spread out animals of all kinds on Thursday, and created Adam in the afternoon on Friday, and it was the last hour of Friday between the afternoon and the night.”
[Muslim Book 02, Chapter 39, Hadith # 6707].
Lesson : as mentioned above in Surah Ar-Rum [The Romans] Ayat 22. And among His (Allah’s) Signs is the creation of the heavens and the earth, What does "Day” mean, and how long can it be? Its reality only Allah knows. We observe a day of 24 hours. However, the days of the formation of the universe are evidently different from our earthly days. According to the Arabic language, a day may mean just a moment, but also aeons (age) of time. In the Qur’an also, Allah has mentioned that a `day’ may be of one thousand or fifty thousand years.