I'll forwarn you, its not the same as in a car. More of your body and mind is involved and so becoming exhausted is more of a factor.
18 hours is a good amount of time to cover the distance, but mentally allow yourself to take more if needed. You say the most you've done is 4 hours, and I find things really start feeling different after about 10 hours. You really begin noticing what is uncomfortable, either with the bike or your gear or you.
Give yourself permission to stop more often to stretch and don't compare your time and experience in the car with how you are doing on the ride.
You'll make it I have no doubt. Just remember, be safe and rest when needed and stop if necessary.
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