The abysmal “revelations” of Mirza Qadiani: 40 years
Mirza was known for being exposed by his own prophecies.
Below is a succinct example of this.
On another page of the same book:
Both screenshots were taken from here: https://www.alislam.org/library/books/TheHeavenlySign.pdf
Mirza wrote the above book in 1892 (the foreword of the book itself says this). His mission was supposed to last forty years according to this prophecy, and at the time of writing he said that “ten full years have already passed” out of these forty. So his mission should last until 1922.
He died in 1908.