I don't feel that IP costs have much to do with it, as they are generally charged proportionate to the number of years or the amount of the contributions.
There is no set time period, and I can remember when they typically ran over 3 years to time in with bankruptcy proceedings. Creditors have pushed for 5 years as the norm, and the way voting is going at the momenet I think we will see six and seven year IVAs becoming more and more popular. They are still viable, if IPs are only going to be charging 15% of realisations, and often creditor loans are taken out over a similar period
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
For further details contact me at
http://www.melaniegiles.com and view my IVA blog at:
http://melaniegiles.blogs.iva.co.uk