Our MFI kitchen lasted 30 years and we only got rid because we were bored of it. It was virtually as good as it was when first installed. Door handles, hinges etc were still fine, as was the work surface (no scratches, marks, etc), as were the cupboard fronts, carcasses, etc.
We now have most of it installed in the garage for DIY/gardening/hobby work - it's been in the garage about 10 years and still going strong, so 40 years in total!
Pretty impressive really.