If we have a serious case of global warming then why does de-icing a freezer take so long without intervention of any kind? Having seen how long it takes then they must be laying porkies on us big time. Maybe my head is caving big time or the adage that a watched kettle takes longer to boil applies here. 
Trying to get back into this and failing badly. Though saying that I did think there might be an answer so shame on me.