long-term
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long-term
Lasting, extending, or taking effect over a long period of time. The word is usually used as part of compounds, but it can also stand on its own.
Die Studie ist langzeit angelegt und soll erst in zehn Jahren abgeschlossen sein.
The study is designed to be long-term and is not expected to be completed for another ten years.
The word is a simple compound of 'lang' (long) and 'die Zeit' (time). So it literally describes something that relates to a long period of time.
Die Langzeitfolgen der Krankheit sind noch unbekannt.
The long-term consequences of the illness are still unknown.
'langzeit' (long-term) is most commonly used as the first part of a compound word, often with a hyphen. It indicates that the second part of the word has a long-term character.
Er befindet sich in einer Langzeit-Therapie.
He is in long-term therapy.
When 'langzeit' (long-term) stands on its own, it is almost only used predicatively, meaning after the noun and often in connection with verbs like 'anlegen' (to design or set up). It is not declined before a noun like a normal adjective.
Das Forschungsprojekt ist auf fünf Jahre langzeit angelegt.
The research project is designed to be long-term over five years.
permanent / lasting
'dauerhaft' and 'langzeit' both have to do with a long duration and can therefore be confused. 'dauerhaft' describes something that remains in place for a long time or permanently. 'langzeit' is usually not used on its own, but as part of compounds such as 'Langzeitstudie' (long-term study), 'Langzeitwirkung' (long-term effect), or 'Langzeitpatient' (long-term patient). This is about a long period of time, but not necessarily something permanent. In practical terms: for a state or condition, you usually say 'dauerhaft'; for certain technical or subject-specific terms, 'Langzeit-' is often used.
Die Langzeitwirkung des Medikaments wird in einer Studie geprüft.
The long-term effect of the medication is being examined in a study.
In der Küche braucht die Familie eine dauerhafte Lösung für das feuchte Fenster.
In the kitchen, the family needs a lasting solution for the damp window.