We don't know, we can only infer how long it will take. If you read CAS you can see the level of detail the UEFA lawyers went down to, ie they scrutinised selected transactions over a limited time. The PL charges relate to 10 years of finanancial reporting and the investigation took 4 years to complete.
I posted this "simulated" scenario re Etisalat....
Maybe the PL witchhunt works like this, the PL lawyers scrutinise every single sponsorship financial transaction from all MCFC bank accounts (in chronological order) to drive the case.
So for example, 01/04/11 MCFC received a payment of £15M into the clubs current account. The "PL" believe this was sent by the owner of MCFC as disguised equity funding and was concealed in the annual accounts ie reported as sponsorship funds from Etisalat and therefore is a breach of PL rules. So in defence MCFC provide documentary evidence proving the sponsorship agreement between MCFC and Etisalat, call on executive officers of both parties to corroborate the agreement and provide evidence from the banks of the sender of the funds. So where does the argument go then ?, the PL lawyers have only one option ie to accuse the defence of dishonesty during the hearing. So then the PL lawyers could spend copious amounts of time discussing the integrity and honesty of the witnesses, the sponsors, accountants, auditors and the MCFC legal advisors throughout the ten year period.