And one other thing...
as my father used to say, "If you don't have time to do it right, when are you going to find time to do it over."
If you want to do the science right, you have to be willing to take the time necessary. Sure, running a supercomputer for 200 days is time consuming and expensive. However, if that's what it takes to do the science right, then that's what it takes. Refusal to do so undermines credibility except for the gullible who don't understand scientific rigor.