Hi kaserdar....
It is best to at least honor the practice with twice daily sessions of any length. If that means that in the morning you only have 10 minutes you could practice, then sit down in DM for 7 minutes and rest for 3, and then go about your day. (or something along those lines) Then practice longer in the afternoon when you have more time.... It is good to practice once a day, but it is better to practice twice a day. I don't think you will experience "negative" impacts from practicing only once a day, but you won't gain the full benefits of a twice daily practice. Even if it's only 10 minutes in the morning/afternoon and a little longer during your other session. I personally don't have a whole lot of time in the morning and usually I only do 10 minutes of SBP and 20 minutes of DM in the morning, anbd during the afternoon I have a full hour and 20, hour and thirty minute practices session. I have experienced no ill effects from practicing this way. Hopefully some others will chime in and give their opinions as well. Good luck.
Love,
Carson[^]