How long does it take to install a Decat on T-jet Punto.

Depends on who's doing it and their experience maybe a couple of hours if you do it on your drive way.

I'm presuming this is in the the U.K. and its worth pointing out that the car won't pass an MOT in the future with the Cat Removed, and if stopped by the police or the DVSA for a road side check, you could get slapped with a vehicle prohibition notice meaning the car can't be used "even to get it home" until the cat is replaced.

These days its just not worth bothering with and any gains are minimal as these engines are designed and tuned to have the Cat in place.

Ye thinking about it I’m going to send it back more hassle than it’s worth and won’t have a chance to fit it before I go for a remap. Thanks