The Reverend William Collins is Mr. Bennet's cousin in Pride and Prejudice by Jane Austen, and he is the one who will inherit the Bennet estate, Longbourn, because the property is entailed and the Bennet children are all female. Collins writes a letter to announce his coming, and the pomposity of it is a great source of amusement to Mr. Bennet, anyway.
Now that he is a clergyman, Collins wants to end the bad feelings which at one time existed between his father and Mr. Bennet. He also apologizes for being the heir due to the entailment (though of course as a poor man he is probably anticipating owning his own property one day).
I cannot be otherwise than concerned at being the means of injuring your amiable daughters, and beg leave to apologise for it, as well as to assure you of my readiness to make them every possible amends -- but of this hereafter.
We discover, of course, that he intends to "make...every possible amends" by asking Elizabeth to marry him, but that will happen later. He tells the Bennets his plans:
If you should have no objection to receive me into your house, I propose myself the satisfaction of waiting on you and your family, Monday, November 18th, by four o'clock, and shall probably trespass on your hospitality till the Saturday se'nnight following.... I remain, dear sir, with respectful compliments to your lady and daughters, your well-wisher and friend, William Collins.
Collins plans to arrive on a Monday and stay nearly two weeks, until the following Saturday. Generally this would be called a fortnight, but technically it is only twelve days.
First, Jane Eyre is by Charlotte Bronte. I think you meant Pride and Prejudice by Jane Austen.
Mr. Collins plans a weeklong visit with the Bennets and makes it clear that he is there to find a suitable wife among the Bennet girls.