French phrase
Combien de temps dois-je consacrer à ~ ?
Meaning
How much time should I devote to ___?
When to use it
Asks how much time to set aside for a task. It is polite and practical in work-related discussions.
Example dialogue
Combien de temps dois-je consacrer à la préparation de la réunion ?
How much time should I devote to preparing for the meeting?
Je dirais une heure, sauf imprévu.
I'd say an hour, barring unforeseen circumstances.