Method section: small experiment for parameter setting
In my thesis, I kept similar issues separately, but referred the reader to the results section discussing results and conclusions from side experiments that lead to certain decisions. This allows to use the results before they are presented in detail.

In your case, the methods could read:


  Preliminary simulation to determine time slot
  
  description
  
  main simulation
  
  Based on teh results of 1. (see link to results section), a time slot of 1 min was chosen.
  ...