41.   Heath and other critics say the process will take decades, if not generations.

42.   His speech took place decades before the development of quantum mechanics.

43.   His face no longer bears evidence of his burn wounds, which took a decade to heal.

44.   However, it could take decades to see bird populations and native plants make a comeback.

45.   If that happens, it will move past Shas, an ultra-Orthodox Sephardic party that took a decade to come into its own.

46.   In either case, a changeover will take decades, and will make the new system much less attractive for the first generations than for the ones that follow.

47.   In addition, cancer usually takes decades to develop, but the increased incidence found in the study was temporary.

48.   It can take a decade or longer to become a top-level synchronized swimmer.

49.   It can take a decade for a company to take an experimental treatment through the expensive tests required for FDA approval.

50.   It can take decades or longer to bring back a species, if it is brought back at all.