[codyZ]

5 second inhale, 5 second exhale, repeat 5 second inhale/exhale X times or for Y minutes, etc.

Note that 5, 7, and 10 are arbitrary numbers that may change per person. The rate of inhale/exhale should be as constant as possible as well, meaning you don't fill/empty your lungs in the first 3 seconds and start slowing the last 2 seconds.