Two-way, valid for 6 journeys on the indicated leg, and does not allow for the journey to be split at stops on the way, nor can it be used by more than one person at the same time.
3 hours from the time of validation (each journey)
No, there is only one fare of € 71, and it is valid for 6 trips from Milan to Malpensa Airport or vice versa.
No, before it is validated the ticket does not expire. Once you have validated your individual trip, you have 3 hours to complete your journey.
Yes, you can use the multi-journey pass tickets to go either way. Individual journeys can be made from an origin to the destination or vice versa.