Hi Leanne
Your period as TRs will count towards your four year residence but you will also need to have had
PR for a minimum of 12 months before you can apply for Citizenship according to the link below:
Step 1: Am I eligible? – General eligibility
However it is very highly unikely that you would need to wait around for 6-7 years before you can apply for Citizenship, I reckon.
Best wishes
Gill