To documentary or not to documentary?

One of the aspects of my project I am unsure about, is how much time I give to the creation of a supporting documentary?  I have been working on more and more film projects and I have enjoyed engaging with the moving image.  As party of my planned trip to Iraq I will be creating a documentary alongside Ian Rowlands, Josh Hodson and Dan Atkins.  I will be creating this either way, what I need to establish is how much of it will form part of my MA?