This is the 253rd most frequent German word.
mindestens
At least.
In this context, 'mindestens' sets a minimum age requirement to watch the movie.
Für diesen Film muss man mindestens 18 Jahre alt sein.
One has to be at least 18 years old for this movie.
Here, 'mindestens' is employed to denote the minimum amount of time required for her task.
Sie braucht mindestens eine Stunde, um ihre Hausaufgaben zu erledigen.
She needs at least an hour to complete her homework.
In this sentence, 'mindestens' is used to specify the minimum quantity recommended for a daily water intake.