The literature review aims to identify the duration of different dementia stages and the ways in which the progression of dementia can be measured. There are three main stages of dementia, namely mild, moderate, and severe, that can further be classified into 7 stages: normal behavior, forgetfulness, mild decline, moderate decline, moderately severe decline, severe decline, and very severe decline. However, an under-researched topic for dementia is the rate of progression from one dementia stage to another. In this literature review, we thoroughly searched articles published on Google Scholar and PubMed and reviewed them. This survey paper is a consolidation of our search conducted. This paper follows the PRISMA formatting and checklist.