What is the fastest way to island park Idaho from cheyenne wyoming?

The distance between the starting point and the destination is 515mi, (828km), and with reasonable traffic conditions it will take approximately 9 hours of driving time. Cheyenne, WY, USA

1. Head southwest on E 22nd St toward Central Ave 341 ft

2. Turn left at Central Ave/US-85

Continue to follow US-85 1.4 mi

3. Slight right to merge onto I-80 W 146 mi

4. Take exit 215 to merge onto E Cedar St/I-80 Bus/US-287/US-30/WY-76 toward WY-789/Rawlins

Continue to follow E Cedar St/I-80 Bus/US-287/US-30 1.1 mi

5. Turn right at Higley Blvd/N US-287 1.5 mi

6. Slight right toward US-287/WY-789 0.1 mi

7. Slight right at US-287/WY-789 42.3 mi

8. Turn left to stay on US-287/WY-789 72.1 mi

9. Turn right to stay on US-287/WY-789

Continue to follow US-287 40.0 mi

10. Turn left at US-26/US-287 43.2 mi

11. Turn left at W Ramshorn St/US-26/US-287

Continue to follow US-26/US-287 55.4 mi

12. Turn right at US-191/US-287/US-89

This road may be seasonally closed 81.9 mi

13. Turn left at W Entrance Rd/US-191/US-20/US-287

Continue to follow US-191/US-20/US-287

Entering Montana 14.0 mi

14. Turn right at Canyon St/US-191/US-20/US-287 0.2 mi

15. Turn left at Firehole Ave/US-20

Continue to follow US-20

Entering Idaho 13.3 mi

16. Turn right at ID-287/ID-87 1.1 mi

17. Turn left at Henrys Lake State Park 0.9 mi

18. Turn left to stay on Henrys Lake State Park 0.2 mi

Island Park, ID