Question: how fast can you drive to hatch eggs?
Answer: How fast can you walk to hatch a Pokémon Egg? It's currently believed the optimal speed for hatching a Pokémon Go is 10.5 KM/H (6.5 M/H). Go slower, and it'll just take you longer to hatch. Go faster, and Pokémon Go will discount the distance you're traveling or, if you go fast enough, ignore it altogether.