When it splits? The sound? A month?
They don't need soaking or warming up. They don't require as much cleaning either, since even if it grows something nasty on the surface, you can wash it away. I don't even take the reed off the mouthpiece, except for maybe once in two weeks or so. When it starts getting smelly, I wash both the mouthpiece and the reed.Do the synthetic reeds still need soaking?