It can also depend on whether it's a renewal or new licence application. In the case of a renewal the unrelated referee interview can be done by phone which usually expedites the process.
Generally, any delays are due to not being able to contact the applicant or one of the referees. Some people who've been asked to be a referee might, for whatever reason, decide to go on an overseas trip. Also, you'd be surprised at how many don't return calls when politely asked to.
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