Very short, yes, but you'll need 1-1.5 hours.
This is not for you if you're not sure footed, or you are afraid of heights. It's very steep and slippery with loose rocks.
It's not a sanctioned hike so go at your own risk.
Once you reach the base of the arch, you're faced with a pretty steep incline. The rock is dusty and crumbly, and sometimes it is hard to get good footing. There were a few times where I found myself thinking, "Welp, I'm bout to slip and slide down the mountain." But somehow, I managed to keep a grip. We also encountered a few small wasp nests going up the left side of the arch. Unless you are a coconut tree-climbing native braddah or sistah, who just got off work at the Polynesian Cultural Center, I'd bring good shoes. The right side was pretty challenging going up, but not as back going down.
Once there under the arch, on a hot day, the shade and breeze coming through the arch is just awesome. I haven't gone on top of the arch yet. First time I didn't have the balls. Second time it was too windy, and my pack was too heavy so... didn't have the balls lol.
Just because you hear about some dude going up in his rubber slippers, or you see pics on IG of girls barefoot in their bikinis, doesn't mean it's real. They probably hiked up with at least shoes. Maybe not clothes. Who knows.
Tracy A. on Koko Crater Trail
When you start up the hill on this one you will ask yourself, am I crazy? Trust me, the workout alone is one you will not forget, but when you get to the top and you see the view of the Ka Iwi Coastline to your back and Maunalua Bay in the front, you will be glad you did it. Regulars do this hike in under 30 minutes and some of them do 5 laps for their Saturday morning workout. You will figure out who they are right away. Enjoy it.
Damien P. on Koko Crater Trail
It's not a moderate trail, but a difficult trail. On the top, the view is howsome.