Bathroom fixtures include a lot of different things. Because of that, it is not possible to say how long they will last without going more specific. Things like toilet cisterns and baths can be incredibly durable. Good quality ceramic baths and toilets can last for over thirty years without any major issues. But when it comes to faucets, their life can be around seven or eight years. But this too depends on the model of the faucet. Other minor things like valves and controls involving delicate mechanisms might need replacement more often.