All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
Hudhayfah narrated that the Prophet said: "Prophethood (meaning himself) will remain among you for as long as Allaah wills it to remain, then Allaah will lift it whenever he wills to lift it. Then there will be a Caliphate that follows the guidance of Prophethood, it will remain among you for as long as Allaah wills it to remain. Then, He will lift it whenever He wills to lift it. Afterwards, there will be an oppressive hereditary rule and it will remain with you for as long as Allaah wills it to remain. Then He will lift it whenever He wills to lift it. Then, there will be a tyrannical rule and it will remain for as long as Allaah wills it to remain. Then, Allaah will lift it whenever He wills to lift it. Then, there will be a Caliphate that follows the guidance of Prophethood." Then, Hudhayfah said, "Then the Prophet kept silent." [Ahmad]
The tyrannical rule is restricted to the Will of Allaah, and there is no evidence that restricts it to 100 years, but the promise of Allaah is the truth and it will absolutely happen. As far as we are concerned, we must return to Allaah and be steadfast on His religion and then His Promise will come.
You should know that the meaning of tyrannical rule is the rule by tyranny and oppression, and it is not possible to authoritatively say that this is related to a particular period of time except with a text from the Quran and the Sunnah. For more benefit, please refer to Fatwa 85916.
Allaah Knows best.