Howdy,
We live about 40 minutes from WDW and it takes us about 75 minutes to get to the ship. If you went straight to I4 you might knock a few minutes off that time, but it gets heavy traffic. Leave the ship as early as you can and you should miss most traffic. Remember there are tolls on the roads to WDW from the terminal, so save a llittle cash, you'll need it.
Have a magical time.
mom x4,grandma x4