Approximately how long did the entire period of the Khulafa-e-Rashideen last?

Explanation

– The period of the Khulafa-e-Rashideen, or Rightly Guided Caliphs, lasted approximately 30 years, from 11 AH to 40 AH, encompassing the successive caliphates of Abu Bakr, Umar, Uthman, and Ali (RA).
– This era is regarded within Sunni Islamic tradition as a model period of governance guided closely by the principles established during the Prophet’s lifetime.
– For exams, note that this period is often referred to in Hadith literature as being followed by a promised era of rightly guided leadership after a period of difficulty.