After having 2 kids and breastfeeding I recently bought some new bras for the first time in years. I bought a couple of Berlei ones that are apparently Australia's #1 bra. They were so comfy I went back and bought another 2! A girl at work was collecting old bras to send overseas for women who have none so I donated a bunch of my old ones. I would hope to get a couple of years out of a bra but I have a few in rotation so they don't individually get washed that often. My sports bras gets washed after every wear. Normal bras get washed every 1-2 days in summer and up to 4-5 days in winter.