Very interesting fact: Time goes about 150 times faster than in the time of the prophet Muhammad. I will show the evidence. So in the Musnad of imam Ahmad (narration number 21618, and its chain (isnaad) is good, so it's trustworthy), it can be found that Zayd bin Thabit learned Hebrew in 15 days and it can be found in that narration that he reached proficiency. For one to reach proficiency, one needs to know at least 16000 words. And Zayd bin Thabit learned all the definitions of the words he learned. So I did research on Hebrew on many words and found that the average amount of definitions for a Hebrew word is 4 definitions. (Zayd bin Thabit was smart)

In today's age, if a smart person wants to learn Hebrew with all definitions, then he could learn 7 words a day with all the definitions. This is hard to grasp, but doable for a smart person. It does feel like a puzzle. 16000:7 = 2285,71. So 2286 days. 2286:15 = 152,4. For easiness, I make it 150. So that's the evidence that time is about 150 times faster than in the time of the prophet Muhammad.

Making complex clothing in today's age with the technology of the far past will take between 3 weeks and a few months. But with contemporary technology, it will take 7 hours. Also, messaging is very fast today than it was in the past. Today it takes less than a second to send a message. But in the past, a messenger was used to send a message. This was slow. If people today would live with the technology of the time of the prophet Muhammad, then they would feel difficulty.

gavin the grey did it in 14 days, so according to your model, time is going slower.

Kim Jung Un learned Chinese in its entirety in 3 hours.

He was on a mountain in North Korea, so it can be argued that on that specific mountain, the time must go super slow.
Perhaps that is also the reason NK is still stuck in the Dark Ages?