Why is a day on mercury 58 days 15 hours and 30 min in earth time if mercury orits the sun the fastest

It may be based on Mercury's moon. Our day is 24 hours because that's the time our moon finishes a 360 degree rotation. Mercury takes 58 days 15 hours and 30 min for it moon to fully rotate.

i think the answer is g1

hope i

-lavira: )