4hr or more is entitled to a 10min break. 6hrs + is an unpaid meal break.

I too, for many years, have worked in an industry where u can work 18hr shifts and get no breaks whatsoever... but I do know that the 4hr/6hr rule is what is meant to be given.

to make sure it's right for you, I think you'd be best to call your local employment services in your area, or your member of parliament can also help with this stuff! try the local fair trading office or wageline even?