1) Ages 2) Ages and ages 3) Ages and ages and 4) Ages galore 5) Ages of long duration 6) Ages on end 7) Ages that boggle the mind 8) Ages upon ages 9) Ages upon ages of time 10) Almost eternities 11) Almost eternity 12) Almost forever 13) An eternity 14) An eternity, seemingly 15) An extremely long time 
European Oncology Nursing Society