He has this exercise in his weight loss set and from memory, he holds it for about 7-8 minutes as there are three other standing exercises in the set and a couple of extra sitting ones. I like it and use it now and then to mix up the exercises that I do daily.
The other exercises in the set are good too so if you can get a copy of the video from Chunyi's website it's well worthwhile - even if you don't need to lose weight.
