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
flagRepublic of Ireland
5%
5%
10%
80%
20
flagFrance
0%
23%
7%
69%
13
flagthe United Kingdom
22%
8%
6%
62%
80
flagGreece
23%
15%
0%
61%
13
flagPoland
18%
17%
9%
53%
5918
flagAustralia
33%
11%
5%
50%
18
flagAustria
11%
33%
8%
47%
36
flagSwitzerland
30%
7%
7%
46%
13
flagGermany
21%
22%
8%
45%
153
flagCanada
16%
25%
16%
41%
12
flagthe United States
27%
30%
10%
31%
86
flagIndia
24%
24%
20%
31%
29