Landing in koa at 12 pm. Till I get a rental car... Google maps says 1 hour 20 minutes from koa to the mount kea visitor center. How much time do I need to acclimate myself to the altitude? (I'm getting mixed reports between 20 min to hour) and how long is the drive to the top, from the visitor center? Just trying to see if its feasible to check into my hotel first. (Sheraton kona). Half hour to hotel, and 1:40 to visitor center from hotel. Sunset is at 6:45