The Orthodox Rashidun Caliphate lasted about

The Orthodox Rashidun Caliphate lasted about
Past Papers: Lecturer — Past Paper MCQs
A: 45 years
B: 30 years
C: 65 years
D: 112 years

The Rashidun span runs from 632 to 661. That is roughly thirty years. It covers the four Rightly Guided caliphs. The period saw rapid expansion and early institutions.