the first one is about 1 minute 10 seconds at most. and its so good they can use it over and over again, sure making it shorter because we know whats coming. fact is, is that its still strong as f**k.
monty pythons had loooads of feeder sketches that were forgotten, but also long ones too, they wrote so much of course stuff was going to be forgotten. but both shorts and longs are remembered by them.
as well as other sketches. people have different tastes but sketches are advised to be kept short for a reason. if the idea has one really strong twist then it can be shorter than usual, to give that twist a powerful,fast delivery which can sometimes suit better than a long build up.
This is called style, and one has never been better than the other, its all opinion. Something I have learned as a comedienne.