You get breaks between 'Phases'. I am not certain how it is still arranged but you do the forst 6 or so weeks of pure theory, have a week off, do sim which I think is these days broken into basic and advanced or something with a week off and a week off after that. The actual day length may vary. In those times between phases you will also go onto field famil so the breaks are a couple of weeks. They try and have you come out of the college to the field with no rec leave liability. As for taking a couple of weeks where you see fit, don't count on it, the course is not going to wait for you.
This of courrse may be different but this is what I gather from the people drifting through from the college of late. I think you will only get 5 weeks leave as you are not working doggos.
As a trainee, you will be 'Stood down' over any public holidays meaning you do not get the extra pay that you would if you worked it or were rostered as OFF and you will also have the Chhristmas Standown as described below available to you. This means you take a couple of days rec and have the whole lot off.
mikepom, I would not go booking flights just yet.