ours was in about 6 hours! The gas ran out after 4, so had to put the emergency on the meter
the top looked too sticky to risk taking it out
Mind you, it could have been the extra sweetener - a friend bought us one of those "ready to cook, just add eggs" ones from tesco (not the more expensive Delia Smith one, some 1970s cook I've never heard of, on offer at £5!)
and o/h was mixing as I was papering the tin.... I passed him the bag of icing sugar instead of the flour & he chucked it in without looking!!
So its a lovely and sweet cake topped with just marzipan