One of the most freeing things to happen in my personal Yoga Practice (three part practice of postures, breath work and meditation) was the realization that practice is not defined by time. Practice means practice. On super busy days when being on the mat for an hour is more STRESSFUL than HEALING give yourself permission to practice for just a minute or two. By being inherently gentle in your definition of what a yoga practice is you will be more able to interweave it into your daily life.
Remember that Yoga is a practice of Ahimsa, which means non-harming. Beating yourself up for not stepping on your mat serves absolutely no purpose. Be kind to yourself always. Quite frankly, you will be a better person for it.
I love this 5 minute moving meditation it is one of my favorite practices – enjoy!