How long for home office decision after priority appointment?

Hi Folks
Have attended priority biometrics appointment on 22Dec (Sat @ 9am) for Set O settlement application in Manchester by paying £3018,50. Home office website says decision will be given with 24 working hours- it's been 48 working hours in my case (full day 24Dec & 27Dec) but no news? Called up 0300 123 2241 & they say applicant has to wait for a home office revert & they cannot give a time frame..
What's your experience? Mine is a pretty straight forward case & shouldn't be any issues.Normally how much time does home office take for decision on priority applications? Is there a way we can call up and ask them why it's taking long or just an agonizing wait!
Kindly guide.
Thanks

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