Ultra light bosonic dark matter like axion may form long-lived condensate. The longevity of the condensate can be understood by the approximate number conservation in the non-relativistic regime. The profile of condensate is obtained via the bounce method, just like Q-balls, as long as the number violating interaction is weak enough. I will discuss the decay processes of the condensate by the number violating interaction, namely the production of relativistic modes. I will show that there are some attractor behaviors during the evolution of condensate that enhance the lifetime.