There are definitely longer hikes, they're just not very well publicized. I've gone on an overnight on the Ko'olau Summit Trail and I'm planning a three day, two-night in January. There are days and days of trails, you just have to know where to look. Almost all of the advertised trails that you find are less than three-hour hikes. Check out my blog from my profile for pictures of my last KST hike with route information.
Never. And I do mean NEVER, rub your eye after eating Jalepeno Kettle Cooked Potato Chips.
My Hiking Blog