US Postal Service Rural Carrier Associate interview questions

met with the post master on the day of my interview, first statement was "i can only guarantee you one day a week of work, do you still want to continue with this interview", after that it was basis work ethic questions, motivations, skills, and she notified me that the first statement that she said was mandatory for her, she couldnt continue the interview had i said "no", even though we get way more work than once a week they cant "guarantee" anything other that a regular carriers relief day which is only once a week.

Easy interview they just ask basic questions like why do you want to work here, do you see yourself doing this job as a career, and how do you feel about working long hours and I'm adverse conditions