The word(s) "days" appears 45 time(s) in 36 verse(s) in Quran in Mohsin Khan translation.

(21) That they may witness things that are of benefit to them (i.e. reward of Hajj in the Hereafter, and also some worldly gain from trade), and mention the Name of Allah on appointed days (i.e. 10th, 11th, 12th, and 13th day of Dhul-Hijjah), over the beast of cattle that He has provided for them (for sacrifice), [at the time of their slaughtering by saying: (Bismillah, Wallahu-Akbar, Allahumma Minka wa Ilaik).] Then eat thereof and feed therewith the poor having a hard time.

(22) For every nation We have ordained religious ceremonies [e.g. slaughtering of the cattle during the three days of stay at Mina (Makkah) during the Hajj (pilgrimage)] which they must follow; so let them (the pagans) not dispute with you on the matter (i.e. to eat of the cattle which you slaughter, and not to eat of the cattle which Allah kills by its natural death), but invite them to your Lord. Verily you (O Muhammad صلى الله عليه وسلم) indeed are on the (true) straight guidance (i.e. the true religion of Islamic Monotheism).

(23) Who created the heavens and the earth and all that is between them in six days. Then He (Istawa ) rose over the Throne (in a manner that suits His Majesty). The Most Gracious (Allah)! Ask Him (O Prophet Muhammad صلى الله عليه وسلم , concerning His Qualities: His rising over His Throne, His creations, etc.), as He is Al-Khabir (The All-Knower of everything i.e. Allah).

(24) Verily, Allah knows those who believe, and verily, He knows the hypocrites [i.e. Allah will test the people with good and hard days to discriminate the good from the wicked, although Allah knows all that before putting them to test].

(25) Allah it is He Who has created the heavens and the earth, and all that is between them in six days. Then He rose over (Istawa ) the Throne (in a manner that suits His Majesty). You (mankind) have none, besides Him, as a Wali (protector or helper) or an intercessor. Will you not then remember (or receive admonition)?

(26) "We have not heard (the like) of this in the religion of these later days (i.e. Christianity). This is nothing but an invention! [Tafsir Al-Qurtubi]

(27) Say (O Muhammad صلى الله عليه وسلم): "Do you verily disbelieve in Him Who created the earth in two days? And you set up rivals (in worship) with Him? That is the Lord of the 'Alamin (mankind, jinn and all that exists).

(28) He placed therein (i.e. the earth) firm mountains from above it, and He blessed it, and measured therein its sustenance (for its dwellers) in four days equal (i.e. all these four days were equal in the length of time) for all those who ask (about its creation).

(29) Then He completed and finished from their creation (as) seven heavens in two days and He made in each heaven its affair. And We adorned the nearest (lowest) heaven with lamps (stars) to be an adornment as well as to guard (from the devils by using them as missiles against the devils). Such is the Decree of Him the All-Mighty, the All-Knower.

(30) So We sent upon them a furious wind in days of evil omen (for them) that We might give them a taste of disgracing torment in this present worldly life. But surely the torment of the Hereafter will be more disgracing, and they will never be helped.