BI request

serious questions. idk what the process is once you start the BI questioner. will an investigator come to your home and question you or your neighbors? do they normally send your BI back to you for corrections? if so, how long before the poly test? how long am i waiting to receive the call for poly test? what other steps are there besides the fingerprints? i do understand that this is where everything takes the longest but i’d like some clarity on things. TYIA