When you're in a meeting that you feel wastes your time, do you try and redirect the conversation flow, silently revisit the agenda, or do you simply...walk out?

If you're Elon Musk, you get up and leave.

When you're as busy as Musk is, you're forced to evaluate your work flow, to see where and how you can be more efficient.

Luckily, the billionaire himself has given some productivity suggestions. In fact, he even wrote a letter sent out to his Tesla employees full of productivity recommendations.

For example, Musk advises that one should "walk out of a meeting or drop off a call as soon as it is obvious you aren't adding value." Sound rude? Not to Musk -- for him, "it is rude to make someone stay and waste their time."

He speaks more about meetings in the workplace, as well. Frequent meetings should disappear -- "Meeting frequency should drop rapidly once the urgent matter is resolved..." -- and excessive meetings are "the blight of big companies and almost always get worse over time." Large, excessive, frequent, and useless meetings are all things that Musk believes get in the way of productivity.

Musk also talks about the value of efficient and quick communication in order to get the job done, citing a dislike for "chain of command" communication. "Any manager who attempts to enforce chain of command communication," he says, "will soon find themselves working elsewhere."

If you're having trouble remembering company rules, or all the many productivity tips you come across, Musk recommends that "in general, always pick common sense as your guide."

Sometimes, the road to productivity really can be that simple.