Hi, I had my expanders for just 3.5 months. This was delayed for a few weeks due to repeat surgery for a massive haematoma that devloped at 3 weeks. This put my expansions back by 3 weeks, hence the delay. I was a private patient, and chose my times, with guidance from my Dr. He wanted me to wait for 6 to 8 weeks from the final expansion, to enable the breast tissue to get use to its new shape. I have had no issues since exchange, and it is alot more comfortable once the expanders are out. Love Chris xx