Im pretty sure its 18 months from date of first pass to complete all 14.
A mate of mine just lost out as he ran out of time.
If that happens I believe you can now sign up with a recognised FTO and do 60 (i think) hrs remedial training and retake all 14 sujects although the 18 month rule then comes into play again.
I could be wrong so please no smart remarks if I am.
DPT