In 4 days, you travel 5/7 of a mile. If in 1 day you traveled 5/7 of a mile, you would multiply 5/7 by 1250, which would get you 893 (rounded up). Since it takes you 4 days to travel 5/7 of a mile, you multiply that product by four to get your new product and final sum:
3,571 days. That would take you about 10 YEARS to complete the trip. Please make sure all of the variables in your question were correct to ensure that this is the correct answer.