I can't speak for 10 minutes at a time, but I can say the following:
1) Something is better than nothing. 10 minutes is better than no minutes. 10 minutes three times daily is way better than 0 minutes however many times daily.
2) I get the best results when I exercise multiple times a day. For example, in the morning maybe I do weights, in the evening, walking or yoga. For me, that's the formula for success. So maybe for you three 10 minute bursts will be a magic bullet too! Try it and see!
Edited/ I see you said an hour. Ok - so 10 minutes 6 times a day... Try it and see!! It can't hurt.