If Miguel has driven g of the total distance in 4 hours, then the rate at which he is driving is g/4.
Let's assume that t is the total time it will take him to reach his destination. Since speed is equal to distance divided by time, we can set up the equation: g/t = g/4.
Cross-multiplying, we get gt = 4g.
Dividing both sides by g, we get t = 4.
Therefore, it will take Miguel a total of 4 hours to reach his destination.
The answer is D. 8 hours.