I think the correct answer is that a GovHack would hack so much Gov they wouldn’t know how much Gov they hacked. Although the 2014 GovHack the annual report attempts to cover the answer in a little more detail.
The answer for 2015 will come to light on the weekend of 3 July and the National GovHack team have recently put a call out for volunteers and sponsors. They are looking for people who might like to organise their own local event, corporate sponsors and Government partners.
This is a great event for anyone wanting to get involved in open data, open Government and civic hacking initiatives. All are welcome and encouraged to get involved.
Read more about the Big Call Out to Australia and New Zealand at GovHack.org.