I am running a simulation that takes forever to be completed! It has some switched-cap circuits inside and currently I use moderate simulation and ASP is also enabled, with 16 threads and 24 cores. I wonder if there is any option to break the simulation into smaller parts and use several computers to run parallel simulation.
instead of doing an endless transient run why don't you try to use SpectreRF simulations techniques?
Here is a basic guide which can save you a lot of simulation time.