That's just it. The program mentioned that missionaries don't really schedule their time. It's basically established for them.
The program wasn’t entirely correct, and that sporadic inaccuracy was not limited to this topic.
While missionaries are given guidelines on how to spend their time - i.e. be back to your apartment by 9:00 - they schedule their own time. How they spend the twelve or so hours a day working is entirely up to them.
The exception is in the MTC (Missionary Training Center), where things are indeed quite regimented for the new missionaries. This is the case for a period of time ranging from three to nine weeks. Essentially, I think, they’re trying to “shock” your system into a good work ethic - not to mention teach you a language in two months.