Oh my, got lugged with the GV expiry. Purchased on 5/2/18 and went last night to book flights, just to get the last two used out of the way (even without the DSC's available any more). And the redemption failed because the GV's have expired (12 month validity). Mentally I had somehow thought they'd be going for three years.
There's an email in with frequent_flyers to see what they say, if there's a way to get them still used or converted into something useful. If you have leftover GV's in your drawers, may be better blow the dust off them and spend them (assuming QF offers a nice way to use them for future bookings)...