Are there hints in the verses of Genesis that the 6 "days" of creation are not literal, i.e. not 24 hour periods but rather some kind of "era".
And God said, “Let there be lights in the vault of the sky to separate the day from the night, and let them serve as signs to mark sacred times, and days and years, 15: and let them be lights in the vault of the sky to give light on the earth.” And it was so. 16: God made two great lights—the greater light to govern the day and the lesser light to govern the night. He also made the stars. 17: God set them in the vault of the sky to give light on the earth, 18: to govern the day and the night, and to separate light from darkness. And God saw that it was good. 19: And there was evening, and there was morning—the fourth day.
How can there be three first "days", if the days (and the sun) were created only in the 4th day?
כִּי אֶלֶף שָׁנִים בְּעֵינֶיךָ כְּיוֹם אֶתְמוֹל כִּי יַעֲבֹר וְאַשְׁמוּרָה בַלָּיְלָה:
For a thousand years are in Your eyes like yesterday, which passed, and a watch in the night
Of course this is not the pshat of bereshit, but , as you said , it is only a hint.