Yes, 2h should be enough if your examiner lets you stay at EPLL. I heard that some of them like to take students for an exam approaches to an unknown airport (well.. at least not the one you performed most of your IR training approaches). Be prepared to fly to EPPO or EPBY. Moreover, I think that if you take both exams at the same time (CPL(A) and IR/ME), you will have to have a 30min break between both exams. CPL also has to be evaluated somehow - most likely, if you don't stay at EPLL, the flight to f.i. EPPO will be treated as the CPL exam. Best way is to ask your instructor at the beginning of your training - he will be able to provide you with the most up-to-date information.