In order to compare between different units of time, we usually use the "Annual Equivalent Rate". As a result, return data is converted to the equivalent rate of one year. Compounding capitalization and financial maths are required for these calculations.

Accumulated Return reflects the relative earnings compared to the initial investment overlooking the time duration. On the other hand, the annual return shows what the investment would have yielded in a yearly basis to achieve that accumulated return.

The unit of time is fundamental to understand return data. An investment that doubles after five years and other one that does the same in 10 years are essentially different. Obviously, the first one is more profitable as it is required to wait less time to achieve the same result. To compare bewteen different investments and time periods it is needed to observe the annual return.