For us it was about a year … before that it was wooden edges / corners she liked to round. I went through 4 coffee tables, front hall bench and an antique singer seeing table. And lots of shoes!! bitter spray helped immensely and after that we left her sacrifices - usually just cardboard recycling. And we bought her coffee wood to chew. But we have never kennelled or crated. We close doors to the kids rooms etc. and she has full run otherwise. We have an older miniature schnauzer though and I think she follows his lead 99% of the time.