Precipitevolissimevolmente !
/Is this maybe the secret behind la dolce vita, that this word is just unpronounceable ?
Does 'as soon as possible' just does not exist in the Italian every day life?
Ah, it is not that romantic, of course different expressions are possible, egg prima possibile.
The history of precipitevolissimevolmente (hey, slowly I can remember it) and the longest Italian word can be found here (in Italian).