Creating one solid part vs using multiple contacts

Hi everyone,

I would just like to know if I have an assembly, that I am performing a FEA on, and within that assembly, there are one or two sub-assemblies with components that are all bonded. Could I model that sub-assembly as a single part rather than use the sub-assembly and include all the contacts, in an attempt to reduce computing time? If so, how would this affect the results?

I look forward to your responses!

SolidworksSimulation