Generally or anecdotally, in your experience.
This is a school where you apply via the council site rather than direct. We're in Hertfordshire and they say it's approx ten days.
We have a few reasons for moving which I won't go into here as it's a bit outing but nothing to affect the application. We already live in the town and there are no other factors that would put us ahead if there were multiple applications - ie it would end up being decided on distance.
My son is year 4, so I'm hoping it's a year with fewer people looking for spaces than say reception. There is only one space so I'm a bit nervous as to whether anyone else will apply.
I also have a four-year-old daughter, so I need to know where my son will end up before we do her reception application so I can get her in on sibling rule if we get a place. Should be fine if they reply in the ten working days as we have until mid-Jan, but if we don't get into this one we want to apply to our second choice (which makes you do it directly so I can't do it at the same time in case they reply too soon). Bit nervewracking!