Most regulatory authorities (but I cannot speak for all) consider that the 1 hour requirement is satisfied by using the distance approved as 60 minutes from a suitable airport for ETOPS planning.
The "60 minute radius" for the B777 ETOPS calculation in our AOC is 432 nm, and for the purposes of considering the "Departure Alternate", a suitable airport within 432 nm is considered acceptable, even though the actual flying time might exceed 1 hour.
Seems a good practical approach to me.
Regards,
Old Smokey