The speed of light is 299792458 m/s.
Per year that is 299792458 * 3600 * 24 * 365.242199 = 9.460528411*1015 meters.
Divided by 1000 that's 9.460528411*1012 kilometers.
To change this to miles you divide it by 1.609344.
9.460528411*1012 / 1.609344 = 5.878499818*1012 miles.
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one lightyear is equal to 5.87849981 × 1012 miles (thats 5 trillion, 878 billion, 499 million, 81 thousand miles).
1 lightyear is equal to approximately 16.098 billion miles when compared with the number of days.
over 26 billion miles 1 lightyear = 9.4605284 × 1015 meters
One lightyear is about 6 trillion miles, so, it would take about 27000 years to travel one lightyear at 25000 MPH. 25,000 mph is about 7 miles a second. Light travels at about 186,000 miles a second. That's 26,600 times the speed your travelling. So if it takes light one year it is going to take your vehicle 26,600 years All the numbers are rounded to whole numbers. To get an accurate time then use the actual numbers.
a mega lightyear