Which country was the first to use 7 days-long week?

Ancient Greece
Ancient Egypt
Ancient India
Babylon
The seven-day week has deep historical origins in the astrology of Ancient Near East, being approximately a quarter of a lunation. It was (independently) adopted by the Persian Empire, in Judaism and in Hellenistic astrology, and (via Greek transmission) in Gupta India and Tang China.
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Answers by country

Ancient Greece
Ancient Egypt
Ancient India
Babylon
answers
flagGermany
23%
10%
6%
60%
30
flagthe United Kingdom
23%
11%
9%
54%
42
flagPoland
20%
17%
10%
51%
4426
flagthe United States
31%
20%
13%
34%
44
flagIndia
29%
17%
29%
23%
17