There are 1.609344 kilometres in one mile. Therefore, 5865696000000 miles is equal to 5865696000000 x 1.609344 = 9439922663424 kilometres.
It would take approximately 97,761,600,000 hours. That equates to 4,073,400,000 days and 11,160,000 days.
In exactly the same way as it appears at the end of your own question!
5,865,696,000,000 is the approximate number of miles light travels in one year.
Five trillion, eight hundred sixty-five billion, six hundred ninety-six million.
One light year, or the distance that a beam of light can travel in one year, at 186,000 miles per second.
If something in space is 10 light years away, we would only observe it as it was 10 years ago, as this is the time light has taken to reach us. A light year is a distance not a time. It is the distance that light travels in a year (about 5865696000000 miles or 9385113600000 Kilometres) so you cannot ask how long ago is 10 light years away. That would be the same as asking how long ago is the bus station away.