Do they enforce if you go off the park? I find it very useful for quick trips to that end of town.
The current sign makes no mention of any conditions along those lines, although I didn't actually check it today.
Two hours, in a marked space and not abusing disabled/parent spaces, seems to be about it.
I
suspect that it would be three hours before you got a note....
This is the last picture of a Lidl parking sign that I have.
Edit - This does, at a glance just now, seem to still be the current sign - on 4/12/2016.