Henriksch,
I think you may be referring to the minimum flight training requirements for conversion of an ICAO IR to a JAA IR.
There are no minimums for conversion of an ICAO CPL, only sufficient training to satisfy the head of training at your chosen training establishment that you are ready to take the 170A "mock flight test". Theoretically, you could turn up on day 1, have check out and satisfy the CFI that you could take the 170A the following day, complete the 170A successfully on day 2 then take your CPL flight test as soon as an examiner becomes available.
As for ground school I'm pretty sure what I stated above is correct but I may of course be mistaken and will check with the powers that be today, if I get a chance.
The other course of action would be to read LASORS. This is the definitive guide for training requirements and outlines the minimum training requirements for conversion of an ICAO ATPL. The link below will take you to the freebie on-line version.
http://www.caa.co.uk/application.asp...detail&id=1591
HTH
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