प्रथम विश्वयुद्ध कति दिन चलेको थियो ?

Option C

From 1 August 1914 to 11 November 1918 is 1564 days, or 1568 days if you include the start of the Austro-Serbian War. Four years, three months. If you count the fighting in Turkey as part of WW1, then 3002 days (8 years 2 months).