The main timing issue relates to the $0.01 bid test.
An OTCQB candidate, among all the other qualifications has to maintain a $0.01 minimum bid in the 30-days prior to application, and be at that threshold on the day all other QB requirements are met.
There really are no other pure timing QB gates - stuff like finding a QB-qualified sponsor, meeting audit requirements, and so on come into play, which may take longer than meeting the $0.01 bid minimum threshold.