Stellantis Slow Production Of Fiat: However the spokesman said that, except for Feb. 12, when the plant will be totally stopped, Mirafiori was expected to operate on a reduced rate of one eight-hour daily shift, instead of the two regular ones, for the period. Fiat-maker Stellantis however has the option to totally stop activity at the facility if demand should prove even weaker in the coming weeks, he added.