How long does it take for the Decision Maker to decide?

We have put in the application for my wife to be our sons carer. The first application was rejected due to not having a P45. Second application has now been in for 12 weeks. When we called to chase they said it was with the Decision maker, this was sent to them on the 23rd November.

Does anyone know roughly how long it takes for them to make the decision?

TIA

Mine has been over this, i’ve just put a complaint in as they told me its not likely to be before christmas. I;d put a written complaint in if i were you.