durante muchos años

= for many years, for years to come, for many years to come, over many years, for years and years (and years)

Ex. Indexes have used controlled-language indexing and authority lists for many years.

Ex. Ward's study is likely to remain a standard reference source for years to come, but trying to sort out the generalities from the particularities is a very difficult business.

Ex. The traditional information sources will continue to play an important role for many years to come.

Ex. Local history collections are being built up in many countries, whether as deliberate policy, based on collections of local antiquaries, or developed casually over many years = En muchos países se están creando colecciones de historia local, ya sea como fruto de una política delibrada, a partir de de colecciones de anticuarios de la localidad, o creadas de un modo casual durante el transcurso de muchos años.

Ex. The work that he has left will live on for years and years.

* * *

= for many years, for years to come, for many years to come, over many years, for years and years (and years)

Ex: Indexes have used controlled-language indexing and authority lists for many years.

Ex: Ward's study is likely to remain a standard reference source for years to come, but trying to sort out the generalities from the particularities is a very difficult business.

Ex: The traditional information sources will continue to play an important role for many years to come.

Ex: Local history collections are being built up in many countries, whether as deliberate policy, based on collections of local antiquaries, or developed casually over many years = En muchos países se están creando colecciones de historia local, ya sea como fruto de una política delibrada, a partir de de colecciones de anticuarios de la localidad, o creadas de un modo casual durante el transcurso de muchos años.

Ex: The work that he has left will live on for years and years.