Themes of Change in Chekhov's Three Sisters

In Anton Chekhov's play Three Sisters, themes of longing and the passage of time dominate the lives of the characters as they yearn for a return to Moscow and grapple with their unrealized dreams. The pervasive sense of ennui and existential discontent resonates throughout the play, often symbolized by their relationships and aspirations. Considering this context, which of the following themes is most prominently represented in the characters' dialogue and actions?