The time allowed for presentation is four months to a lay patron, and six to a spiritual patron; six months is stipulated for a mixed patronage when exercised in common, four or six months when turn is taken . The interval begins the moment announcement is made of the vacancy. For one who through no fault of his own has been hindered in making a presentation, the time does not expire at the end of the period mentioned. When his candidate has been unjustly rejected by the bishop, the patron may appeal, or make an after presentation.