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
6%
0%
13%
80%
15
flagFrance
0%
23%
7%
69%
13
flagGreece
23%
15%
0%
61%
13
flagthe United Kingdom
25%
7%
7%
60%
68
flagPoland
19%
17%
9%
53%
5653
flagAustralia
33%
11%
5%
50%
18
flagAustria
9%
32%
9%
48%
31
flagGermany
22%
22%
6%
46%
114
flagCanada
10%
30%
20%
40%
10
flagSwitzerland
36%
9%
9%
36%
11
flagIndia
25%
21%
21%
32%
28
flagthe United States
31%
32%
11%
24%
70