[1] : WordNet (r) 2.0

long time
     n : a prolonged period of time; "we've known each other for
         ages"; "i haven't been there for years and years" syn: age,
          years
see also:
age years 

[2] : Moby Thesaurus II by Grady Ward, 1.0

28 moby thesaurus words for "long time":
   aeon, age, ages, century, distance, eternity, extension, extent,
   infinity, length, lengthiness, linear measures, long, long while,
   longitude, longness, measure, mileage, month of sundays,
   overall length, perpetuity, reach, right smart spell, span,
   stretch, yardage, years, years on end

Big Time >> B Words
Big Time, definition of term: Big Time
big+time_pag1.html

Access Time >> A Words
Access Time, definition of term: Access Time
access+time_pag1.html

Common Time >> C Words
Common Time, definition of term: Common Time
common+time_pag1.html

At A Time >> A Words
At A Time, definition of term: At A Time
at+a+time_pag1.html