I have been doing this since my counsellor has given me this to do as my homework every week.
I have been seeing my counsellor now for almost 2 months and have been doing 5 minutes of mindfulness everyday since but I will do 5 minutes everythime I feel like I am going on a downward spiral and it has helped me regain my thoughts and recenter myself.
I feel that 5 minutes is long enough for me at the minute, as I have found going any longer I start to let everything seep into my mindful time and the thought start taking over.
With doing the 5 minutes is just enough time for me to gather myself together to be able to get on with the task I have given myself to do, and would then do another 5 miuntes when I have completed the task just to help me get my focus back.