What is an easy Shakespeare soliloquy to memorize that is at least 20 lines long?
Hamlet's "To be or not to be..." soliloquy is pretty memorable but not the best for an audition because it is so familiar.
The internet has soliloquies for male or female depending which appeals to you.
Prospero's Soliloquy from the "Tempest" is the necessary length. Act 5, Scene 1: "Ye elves of hills, brooks, standing lakes and groves..."