How many movies have Giorgos Velentzas and Marios Markopoulos collaborated on?

They have worked on 2 movies together! Their first movie together was Ο Ανηψιός μου ο Μανώλης (1963) while their highest rated movie together was Which Way to the Septic Tank? (1978). They have not worked together since Which Way to the Septic Tank? (1978).