particle system

I want to have a particle system with this operation mode:

1.- the particle system casts spheres
2.- after 5 second each sphere should transform in a cube


I have not problem with the first one, but i do not found the way to transform each particule after 5 minutes

 

using sub_Emitters you can on_death replace the sphere with a cube. if you need it to transform gradually you may need to use a few subEmitting processes- -- though that could get ridiculous in scope

https://docs.unity3d.com/Manual/PartSysSubEmitModule.html