Originally Posted by
jpatokal
Not any more they aren't -- it's 43 minutes by direct express train from ICN to Seoul Station. With 23 hours, you'll have plenty of time to explore the city.
Yes it has been 4 years since I've been.
However as a parent of 3, I know that trip preparation take double or triple the time with young kids. So I like to keep things simple. YMMV