Hi Gill. In the majority of cases the PPI money simply goes to giving the creditors more of their money back. The term will only reduce if you have paid back all of the original debt, plus fees and possible interest earlier than the predicted end date of the IVA.
My opinions are merely that .. opinions based on experience. Always seek professional advice.
IVA Completed 23rd July 2013 .... C.C. 10th January 2014