"Tomorrow is a Long Time" is about longing for a loved one, pure and simple. Specifically, it's about Suze Rotolo.
Rotolo is the woman seen walking with Dylan on the cover of his second studio album, The Freewheelin' Bob Dylan
. She dated Dylan from 1961 to 1964 and was a formative influence on his life and art. Their story is told in part in "Ballad in Plain D