Walking distance between Mayfair Marriott and Courtyard by Marriott?

Could you pls advise?

Do you know the walking distance between these two hotels, Courtyard by Marriott Bangkok and Mayfair, Bangkok - Marriott Executive Apartments?

On Google maps, they are very near to each other. However, Google Maps said if you walk, it will take 20 minutes, which is strange. 

I also tried Bing Map, which said it takes only 6 minutes.

Do you know which map service is more accurate?

Thank you