This is the 3875th most frequent Swedish word.
krävts
"Has been required" or "has been demanded."
Here, 'krävts' is the past participle form of 'kräva' used to indicate an action (requiring effort) that has been completed.
Det har krävts mycket ansträngning för att nå detta mål.
It has required a lot of effort to reach this goal.
In this sentence, 'krävts' reflects its use in a conditional past perfect mood, indicating hypothetical necessity.
Om provet hade varit svårare, hade det krävts mer tid för att slutföra det.
If the test had been harder, it would have required more time to complete it.
'Krävts' here is used in a future perfect form, expressing an action that will be completed relative to another future point.