I wish to etch some 1oz (35um) copper clad board in one of your vertical Etching machines, how long will this take please ?

There are obviously many factors that affect the rate of Etching, such as Temperature of the Etchant, Freshness of Etchant, the ratio of copper being Etched away against the total panel size etc but as a rough figure it should take one minute to Etch 1oz (35um) copper with fresh warm Ferric Chloride FeCl3