Hi,The guidance on this is really loose and is ultimately down to caseload. Your application in theory should be placed at the front of the queue for every decision that needs to be made at the various stages of review - Home Office will try and process ASAP/honour the priority fee but it is never guaranteed.
If you applied for a priority or super priority visa and your application is not straightforward, you may have to wait longer, but your application will still be put at the front of the queue at every stage of the decision-making process. (
https://www.gov.uk/guidance/visa-decisi ... -uk#faster)
When did you send the rest of your documentation in? And did their correspondence with you highlight processing times?
All best