Pendant and the verb se passer

Bonjour Krissa, Here is the grammar lesson associated with expressions of duration of time: «Note that these cases all express a duration with a clear beginning and end. Whether they take place in the past, present, or future, they are considered as enclosed in a specific time-frame. In French, you use pendant/durant + [durée], or simply the duration itself, to express a duration with a clear beginning and end. Since the phrase in question, «Je vais me passer de pain pendant une semaine» has a clear beginning and an end, i.e. one week only, regardless of the start day, the use of pendant is appropriate. Take a look at a comparison example: Beginning tomorrow, I am going to go without bread for a period of time --> À partir de demain, je vais me passer de pain pour une période de temps. In this example, this grammar rule would be applicable because there is no clearly defined beginning AND end, just the beginning or start of the period, i.e. demain. This sentence expresses a future duration, with a notion of intent, hence the use of pour. In French, you use pour + [durée] only to express a duration in the future. J'espère que ma réponse vous aidera. Bonne chance et bonne continuation dans vos études en français.