In as short a time as Mr. Collins’ long speeches would allow, everything was settled between them to the satisfaction of both; and as they entered the house he earnestly entreated her to name the day that was to make him the happiest of men; and though such a solicitation must be waived for the present, the lady felt no inclination to trifle with his happiness. The stupidity with which he was favoured by nature must guard his courtship from any charm that could make a woman wish for its continuance; and Miss Lucas, who accepted him solely from the pure and disinterested desire of an establishment, cared not how soon that establishment were gained.
– Jane Austen
Pride and Prejudice, Chapter 22. Charlotte Lucas accepts Mr. Collins’s proposal in a passage that satirizes marriage and is dripping with sarcasm and irony. We are told Collins makes a "long speech" of it and the deal gets "settled." Because nature "favours" Collins with stupidity (irony), there is no charm to make a woman wish for a long courtship. So Charlotte accepts him from the "pure and disinterested" desire for marriage, and doesn’t care how soon that marriage is. She marries, not for love, but for a home and security.