A gigasecond is one billion seconds. It is just over 31 years. Most people will retire by 2 gigaseconds.
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It can be. Normally long is an adjective (a long walk, a long time) but it can act as its own adverb form in uses such as "Have you waited long?" (i.e. for a long time) or idiomatic uses such as "all night long."
long division is division that is of course long.
A long freight train.A long freight train.A long freight train.A long freight train.
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The opposite of long is.... short.