Don

Here are verses in the ESV that have all of “day, evening, morning” in them.

(Gen 1:5) God called the light Day, and the darkness he called Night. And there was evening and there was morning, the first day.

(Gen 1:8) And God called the expanse Heaven. And there was evening and there was morning, the second day.

(Gen 1:13) And there was evening and there was morning, the third day.

(Gen 1:19) And there was evening and there was morning, the fourth day.

(Gen 1:23) And there was evening and there was morning, the fifth day.

(Gen 1:31) And God saw everything that he had made, and behold, it was very good. And there was evening and there was morning, the sixth day.

(Exo 18:13) The next day Moses sat to judge the people, and the people stood around Moses from morning till evening.

(Lev 6:20) “This is the offering that Aaron and his sons shall offer to the LORD on the day when he is anointed: a tenth of an ephah of fine flour as a regular grain offering, half of it in the morning and half in the evening.

(Num 9:15) On the day that the tabernacle was set up, the cloud covered the tabernacle, the tent of the testimony. And at evening it was over the tabernacle like the appearance of fire until morning.

(Num 9:21) And sometimes the cloud remained from evening until morning. And when the cloud lifted in the morning, they set out, or if it continued for a day and a night, when the cloud lifted they set out.

(Deu 16:4) No leaven shall be seen with you in all your territory for seven days, nor shall any of the flesh that you sacrifice on the evening of the first day remain all night until morning.

(Jdg 19:9) And when the man and his concubine and his servant rose up to depart, his father-in-law, the girl’s father, said to him, “Behold, now the day has waned toward evening. Please, spend the night. Behold, the day draws to its close. Lodge here and let your heart be merry, and tomorrow you shall arise early in the morning for your journey, and go home.”

(Act 28:23) When they had appointed a day for him, they came to him at his lodging in greater numbers. From morning till evening he expounded to them, testifying to the kingdom of God and trying to convince them about Jesus both from the Law of Moses and from the Prophets.

It seems to me that the non-Gen 1 uses do not indicate a 24 hour day.

If someone said to me, “it was evening, it was morning, the second day” it would not at all be clear to me that a 24 hour day was indicated, rather I would suspect a poetic metaphor was being used, as pointed out evening to evening or morning to morning would be a better indication of a 24 hour day. And a natural metaphor (for me) is evening is the onset of darkness/night, which is associated with less order and morning is the onset of light/daytime, which is associated with more order. And God is increasing the order in Creation in each day, so this metaphor makes sense in context.