Amount of time can be synonymous to duration, length of time, span, period, interval, stretch, stint, spell, term, session, phase, and season. These synonyms differ from one another in terms of specificity and usage. "Duration" and "length of time" are more general and can be used in any context, while "interval" and "stint" are more commonly used for specific time periods or activities. "Span," "session," and "phase" can be used to express the duration of events or projects, while "term" and "season" are mostly used in academic and sports settings, respectively. Choosing the right synonym for the amount of time can make your writing more precise and meaningful.