[Hebrews 11:6]

Nor should you be. The seventh "day" is already very much longer than thousands of years and remains on-going, as is indicated by references not only in Psalms and Hebrews but also in Genesis itself, which explicitly and conspicuously omits "morning" and "evening" brackets for it. The Hebrew word "yom" translated as "day" had four literal meanings, one of which was "long indefinite period." Unlike English, which has numerous words for that, Hebrew had only that one.

The Bible leaves it to us to determine, if we are interested, how long God's first "week" of creation takes; and we've learned very conclusively that our universe is nearly 14 billion years old and our earth 4-1/2 billion. Our duty is not, as you put it, to constrain God but rather to understand and then respond to Him.

[null and void]

One could argue that in Genesis, every ‘day’ ends with ‘and the evening and the morning were the nth day’ closing out that ‘day’.

Every day save one.

That’s the seventh day, the day The Creator rested.

That day isn’t over, He is still on vacation, which explains a lot about the current condition of humanity and the planet...