How long does it take to put in a new catalytic convertor in an Audi A4?

I have a 2002 audi a4. my Dads friend works at an audi service center and is sneaking the car in and going to put in a new catalytic converter. He is also going to put in new shocks and struts and mounts? I was wondering if anyone new how long this may take as they didnt give me a loaner car haha... They are going to start tomorrow at 8am sharp, So he said... thanks so muchHow long does it take to put in a new catalytic convertor in an Audi A4?It also may need new O2 sensors as well. Keep this in mind too, when you do the struts, you need an alignment too. This car since it is "snuck in," may take all day.How long does it take to put in a new catalytic convertor in an Audi A4?i have a 78 corvette and have taken my catalytic convertor out because of build up... a smart thing to do is to get a new exaust system... but if ur wanting to put in a new converter ur self it wud take couple hrs with the right equipment.... in a shop it take them bout 1 hr or so....