All my crew but one learned in less than one month, though the Lab I rescued was already house trained when I got her. My ACD was house trained within a week. The exception is my Sheltie, who took about 10 weeks to become house-trained, and even now, at 6 years, still won't wait long when she says she needs to go. She's not known for her smarts, though. My male Kerry was known to leave "messages" if I made him mad at me, usually when I left him at home when he thought he ought to go with me, but this was much more involved with his stubbornness.

Mac