Possible Clues:

• "I'll tell you the rest another time," and what can be said about the starts of 20-, 28-, 36-, and 49-Across
• “We could be here for a bit...,” and a hint to each circled word
• Perhaps it¿s a description of Tower of Babel in Bible (2'1,1,4,5)
• 'Too much to go into now'