If you are going to be on the I35 through Dallas, you would be about 15 minutes from the IN N OUT Burger in Frisco.
After you go through Dallas, heading North on the I35, about 15 minutes north of Dallas it the 121. Take the 121 towards McKinney (I think the sign says “McKinney”) and proceed about 10 minutes to the Preston offramp. Make a left on Preston and the IN N OUT Burger is just a few blocks up on the right.
So it’s not that far from the I35, maybe 7 or 8 miles due east on the 121 to Preston. Then off at Preston, Left (north) and up a few blocks on the right.
Good luck and enjoy.