Wall clock hours needed

I am writing a proposal to use Pleiades to run CESM, WACCM in particular.  Is there a simple way to estimate the appropriate processors per run and wall clock hours needed per run?  I need to run with interactive chemistry.  Specified dynamics will probably work initially but I am also interested in studying dynamics changes following ozone depletion.  I plan to run using preindustrial conditions, at the lowest lat/long resolution.  I am new to CESM/WACCM, so any advice is appreciated.  Thanks!
 
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