Near-by resistors; or component grouping will effect resistor derating. A resistors power dissipation must be further reduced if it's effected by near by components or resistors that are radiating heat which would effect the surrounding ambient temperature [of the resistor being effected].
The closing is scheduled with the refinancing company, mortgage broker, real estate attorney and the home owner. It takes approximately one week to schedule and conduct the appointment with the closing attorney. Depending upon the complexity of the loan, the refinance process can take from two weeks to eight weeks.
You can also consider the traditional refinancing breakeven formula: how long will it take you to recoup the money you spend, assuming your monthly payment decreases (divide the monthly savings by your total closing costs to figure out how many months this will take).