It can arise at vetting, at the immigrant classification determination under EB-1 or EB-2, and again at an interview or in a later request for documents. Because it may surface more than once, the record work belongs before the online application rather than being deferred until a question arrives.
Plan around requests you cannot schedule
Official material describes parts of the process in terms of weeks, but that is a description rather than a promise, and no one can state a completion date for an individual case. Visa availability also affects when a classification can move forward. Build the plan so that a document request does not collide with a resignation, a school enrolment, or a lease.
Keep the chronology updated as new travel happens. Build the plan so a document request cannot collide with a resignation, a school enrolment, or the end of a lease, because requests arrive on their own schedule and cannot be booked in advance. An earlier overstay can arise at vetting, at the classification determination, and again at an interview or in a later request for documents, so the record work belongs before the online application rather than being deferred until a question appears.
Official material describing parts of the process in weeks is a description rather than a promise, and no completion date can be stated for an individual case. Visa availability also affects when a classification can move forward. Keep the chronology updated.