Can you schedule when you do each individual session of Driver Training?

What I mean is that when you sign up to do 6 hours, which is 3 2 hour sessions, can you schedule each session at your convenience? Or does the instructor/company choose when you must do it? For example, could I do one session tomorrow, and decide to do the next session 3 weeks later, and then the last one a week later if I wanted to?|||You choose,.