I want to know the answer to the following question:
How long did it take to compile the Dialectological Atlas of the Russian Language?
All the background I'm provided with is that "In modern times, the monumental Dialectological Atlas of the Russian Language (Диалектологический атлас русского языка [dʲɪɐˌlʲɛktəlɐˈɡʲitɕɪskʲɪj ˈatləs ˈruskəvə jɪzɨˈka]), was published in three folio volumes 1986–1989, after four decades of preparatory work.". Is that enough to answer the question?