"The good services take time."
Translation:Die guten Dienste brauchen Zeit.
Looking at it backwards: If you are talking German you will not be able to reflect long on the endings. So in plural: with most "articles" preceding the adjective, the adjective ends on "-en" In singular about half the time. Of course it is better to learn the rules well, but in actual use it is not always easy.
''guten'' is nost just the acusative form of the masculine article, it is used a lot. This might explain it better (check out the nominative + plural) : http://www.canoo.net/services/OnlineGrammar/Wort/Adjektiv/Deklinationstyp/Schwach.html