Feature: Display working time in preview for (batch-) quiz exercises

[florian-glombik]

Is your feature request related to a problem?

When working on quiz exercises (in batch mode) as a student I would like to know how much time I will need to complete the exercise.
This might have an effect on the time when I start the quiz (e.g. I have 20 minutes left and do not know how much time I will have for the Quiz). Right now the available working time is not displayed, and the amount of points that can be reached is the only reference point before starting the quiz.

Describe the solution you'd like

Add the working time to the Exercise details (at least for quizzes in batch mode)

Describe alternatives you've considered

Infer the working time from the points that are achievable by completing the quiz exercise.

Additional context

This is how the preview currently looks like for quiz exercises in batch mode: