It varies according to the current worl loads of the IP and then the Insolvency Service --- mine took the best part of 6 months. It is an odd situation .... you don't want to be on there, but it feels more real once you are !
My opinions are merely that .. opinions based on experience. Always seek professional advice.
IVA Completed 23rd July 2013 .... C.C. 10th January 2014