About as long as it takes you to do a IPA (isopropyl alcohol) or Prepsol wipe down to remove any remaining residues from the polishes lubricating oils.
Speed 6 on a PC; I'm sure someone can reference you the equivalent on a Flex; but probably as fast as it will go considering you're using a white pad. Any Menz. polish is going to take quite a while to take down if using any kind of RO machine.