hi Londonmet
first let me start by saying that I m not an employee at EY. I might be able to answer your question though.
I think you are asking how long does it take to transiiton from the A320 to the 330/340?
If that is the case, then as of about a month ago, the company requirements were 18 months and 500 hours on the 320. I dont need to write any name but this info is reliable. these minima can be changed at anytime at company's discretion.
at the moment, there are 2 320 pilots/month transferring to the 330. (anybody feel free to correct me if i m wrong). it was rumored to change from 2/month to 6/month but a friend told me it wont be the case.