In Scrum, all the mentioned events are time-boxed. Sprint Planning is time-boxed to a maximum of eight hours for a one-month Sprint. Daily Scrum is time-boxed to 15 minutes. Sprint Review is time-boxed to a maximum of four hours for a one-month Sprint. Lastly, Sprint Retrospective is time-boxed to a maximum of three hours for a one-month Sprint. Therefore, all of the above is the correct answer.