This is a great question.
I'm gonna go in a step by step fashion, so bare with me.
First off, we agree that Paradise/hell are a lot more bigger (massive) than Earth.
The following verse is going to compare the measure of Time in God's reference with Time in our reference.
[Quran 22.47] They challenge you to bring forth that torture [in Hell] and Allah will not break His promise; a day of your Lord [Paradise/Hell promise] is like a thousand years of what you count.
The theory of general relativity says that time passes slower near an object more massive than Earth, meaning at this point, Quran is coherent with science.
Furthermore, brief scientifical facts:
"Our solar system is 4.57 billion years old. Earth started accreting concurrently with the sun and our neighbouring planets 4.57 bln years ago. However the universe is 13.7 ± 0.2 bln years old. This places the age of Earth at one third the age of the universe (4.57 bln/13.7 bln = 1/3)."
[Quran 7.54] And your Lord, Allah, who created the Heavens and the Earth in six days and then settled on the Throne...
Bare in mind the frame of reference:
"Meaning that those six days are on the Throne; so the frame of reference for creation is the Throne, not Earth."
Looking at the following verses,
[Quran 41.9] Say: "Is it that you deny Him [Allah] who created the Earth in two days? And you claim others to be equal to Him? He is the Lord of (all) the Worlds."
As well as
[Quran 50.38] And we have created the Heavens and Earth and everything in between in six days and We were not touched by fatigue.
"In God's Throne time, Earth is 2 days old while the Heavens, Earth and everything in between are 6 days old. This makes the age of Earth to be one third the age of the universe (2/6 = 1/3). Similarly in Earth time, the age of Earth is 4.57 billion years while the age of the universe is 13.7 billion years; this is also one third (4.57 bln/13.7 bln = 1/3). So it is the same ratio in Earth time or in God's Throne time. The theory of general relativity explains why time at God's Throne passes slower than on Earth. General relativity explains why 6 days passed at God's Throne but we measured it as 13.7 billion years (that is each day at God's Throne measures around 2.28 billion years on Earth)."
Don't forget that God call us to ponder and reflect in His verses [using our brain/mind capabilities]. Nothing is symbolic.
If you are interested in more scientifical approachs of the Quran visit this website