The term 'AMOUNT OF TIME' can be represented by two different crossword solutions: ERA and AGE. An ERA is a period of time in history, usually lasting hundreds or thousands of years, that is marked by certain characteristics or events. An AGE is a much shorter period of time, usually lasting decades or centuries, that is also marked by certain characteristics or events. Both terms refer to a specific amount of time, but the length of time they refer to is different.