You use extended to describe things which last longer than usual.
If something is extensive, it covers a large area.
An extensive effect is very great.
Extensive also means 'covering many details'.
Adj. | 1. | extended - relatively long in duration; tediously protracted; "a drawn-out argument"; "an extended discussion"; "a lengthy visit from her mother-in-law"; "a prolonged and bitter struggle"; "protracted negotiations" long - primarily temporal sense; being or indicating a relatively great or greater than average duration or passage of time or a duration as specified; "a long life"; "a long boring speech"; "a long time"; "a long friendship"; "a long game"; "long ago"; "an hour long" |
2. | extended - fully extended or stretched forth; "an extended telescope"; "his extended legs reached almost across the small room"; "refused to accept the extended hand" unextended - not extended or stretched out; "an unextended arm" | |
3. | extended - drawn out or made longer spatially; "Picasso's elongated Don Quixote"; "lengthened skirts are fashionable this year"; "the extended airport runways can accommodate larger planes"; "a prolonged black line across the page" long - primarily spatial sense; of relatively great or greater than average spatial extension or extension as specified; "a long road"; "a long distance"; "contained many long words"; "ten miles long" | |
4. | extended - beyond the literal or primary sense; "`hot off the press' shows an extended sense of `hot'" figurative, nonliteral - (used of the meanings of words or text) not literal; using figures of speech; "figurative language" | |
5. | extended - large in spatial extent or range or scope or quantity; "an extensive Roman settlement in northwest England"; "extended farm lands"; "surgeons with extended experience"; "they suffered extensive damage" big, large - above average in size or number or quantity or magnitude or extent; "a large city"; "set out for the big city"; "a large sum"; "a big (or large) barn"; "a large family"; "big businesses"; "a big expenditure"; "a large number of newspapers"; "a big group of scientists"; "large areas of the world" |