If you choose to deactive your account now, you can still reactivate your account in the future. Language exchange requires time and effort. So make your own timetable. But I would not choose to deactivate my account. Cause it will take some time to for the italki team to approve my reactivation request. What I will do is to change my italki status to Busy with the work or test. And post a message on my own blackboard and telling my friends when I will be back.