Time is relative.

A rabbit takes 1 minute to reach the goal while a turtle takes 20 minutes, a snail might take 1 hour.

It takes a pentium III 1 year to finish a complex calculation while it takes maybe 1 day for a Quad Processor to complete the same thing.

For humans, driving 200km/h per hour may seem too fast for most people, but for race drivers or people with quick reflex it may consider normal. A person with fast reflex is like a quick computer compared to people with slow reflex.

Also the metabolism rate, pulse signal travelling inside our body, rate of cell lifespan, how fast it grows affects how people see time compared to other species.

For example 1 minute for a human seems very fast but for snail/turtle will slow reaction it might seem long.

10 years may be nothing to humans while 10 years may seem like a lifetime for a dog.

And since god is much superior than humans. We can assume god normally take in information 1000 times faster than us, move 1000 times faster than us, while on the other hand last forever. So the bible says 1 god day is equivalent to 1000 human days.

I think Buddist also have similiar concept when it comes to heaven vs earth day.

The Japanese tale of Urashima Tarō has similiar theory.