Access failures are the classic site-day problem: missing keys, locked risers, alarm panels nobody can operate, no one on site who knows the building. Each gap either extends the visit or forces a return, and return visits go to the back of the booking queue. Missing records slow things too, because an assessor who arrives without the previous report, door inspection history or external wall information has to reconstruct context that should have arrived in an email, a preparation job covered in how to obtain a fire risk assessment.
On the report side, the delay usually lives in drafting and review rather than inspection. Long reports assembled by hand from photographs and notes take time, and reviewer availability adds more. When you compare consultancies, ask how the report is produced and who signs it off; a firm that can describe its drafting and review process will usually also commit to a turnaround. Urgent findings should never wait for the document: a competent assessor flags immediate hazards to the responsible person on the day they are found.