Rv,
I have two older dolphins at rent houses that stay in the pool almost 24/7.. I take them out once a week, sometimes every two weeks to clean them. They are about 15 years old. I bought them used and have been using them for about 7 years or so.. The plastic does tend to get bleached out, but they are a tool, and not a show piece, so I don't care.
At my house, I have a newer dolphin that I tend to take out more often, mainly because I don't like to see it in my pool and I don't need to use it but one or twice a week, unless it is leaf falling time..
Thanks,
Jim R.