That's a good pool of questions to choose from. How long do you think would not take an applicant to fill all of the questions? My questionnaire for the same p

That's a good pool of questions to choose from. How long do you think would not take an applicant to fill all of the questions? My questionnaire for the same purpose (hiring) has 30 similar questions, yet including some that query soft skills. E.g.: "you got the following email from a customer, please write down your answer to her inquiry". Or: "the CFO, the CEO and the CTO are approaching you with the following different requests, how do you react to them and in which order would you process them".