Darragh O'Brien (Dublin Fingal, Fianna Fail) | Oireachtas source

That could be read together with section 164(2)(b). You could also look at every different scenario.

If someone is coming in for a large project, be that residential, infrastructure or whatever it might be, they will know the timeframe within which it should be built. The completion of the work has to happen within the permission period. If someone thinks it is going to be ten years or four years he or she will be told the standard provision is for five years. If they think the work will take longer than that at application stage, in the main, they will specify that.