Realms : About a certain Deva's concubine's rebirth?
Your question is: is it scientifically and metaphysically true that there are different time scales for the devas, humans and other beings? If so, my answer is yes. 

Metaphysically, there are different realms of beings. Those celestial beings have longer lifespans and their days and nights are longer than humans, depended on the layer of celestial realm they belonged. some's day and night is equal to a year in human's, or equal to thousand years of the human time scale. 

Scientifically, these could be proved. In the Solar System, some planets take longer time to circulate the sun, compared to earth's 365.25 days (a year); some planets' self-rotation is longer, compared to earth's 24 hours (a day). It is estimated that the sun takes 25000/26000 years to circulate the galactic center, and the milky way is circulating another astronomical object. Only this will make the time scale different, not to say that there are Einstein/quantum level of force and phenomena.

Buddha also talked about the lifespan for human was co-related, from 84000 (I believe this figure equal to the meaning of numberless in Buddha's time) to 100. When in the 100, it will reduce to 10, as the karma of the kalpa going worser and worser. 

This "time lapse" stories not only exist in the Deva stories (Indian), also told in Chinese myths.