How far is the Naturalization interview scheduled once the notice for a scheduled interview is sent? Thinking of traveling for 2-3 weeks while my n400 is being processed and the “Estimated Wait Time=20 days” for the next step which is my naturalization interview. 

Will the interview be scheduled a couple of days or weeks from when the application says it has been scheduled? Does it depend on the field office? 

Any help or pointers will be appreciated.