What was the exposure time of this photo?

about 10 seconds
about 10 minutes
about 1 hour
about 8 hours
The length of stars trails is pretty much the same as the distance trav­elled by an hour hand of clock during 30 minutes. But the Earth rotates twice as slow compared to the hour hand of a clock (one rotation per day, while clock's hour hand makes two).

Answers distribution

about 10 seconds
about 10 minutes
about 1 hour
about 8 hours
answers
flagMalaysia
10%
20%
60%
10%
10
flagFrance
8%
4%
56%
30%
23
flagCanada
20%
8%
48%
24%
25
flagNorway
33%
4%
47%
14%
21
flagLithuania
0%
8%
41%
50%
12
flagthe Philippines
26%
21%
39%
8%
23
flagthe United States
22%
12%
38%
26%
291
flagthe United Arab Emirates
30%
15%
38%
15%
13
flagthe United Kingdom
20%
16%
37%
25%
193
flagSpain
9%
0%
36%
54%
11
flagPoland
16%
12%
35%
35%
6769
flagItaly
5%
17%
41%
35%
17
flagGermany
20%
10%
34%
31%
107
flagSwitzerland
8%
33%
33%
25%
12
flagRepublic of Ireland
18%
6%
31%
43%
16
flagUnknown
11%
11%
30%
46%
423
flagIndia
34%
17%
29%
18%
191
flagthe Netherlands
11%
23%
29%
35%
17
flagPakistan
42%
7%
28%
21%
14
flagAustralia
33%
13%
20%
33%
15

Gender

men33%
women33%
about 10 seconds
13%
18%
about 10 minutes
10%
13%
about 1 hour
33%
33%
about 8 hours
42%
34%

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What was the exposure time of this photo?
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