I can't imagine sitting in a row of three for that length of time, especially when travelling as a two. You would either have someone in the window who would need to be getting out, or someone in the aisle who you'd be asking to stand to let you out to use the loo or just to stretch your legs.
For us two options to avoid that even if it means not sitting next to the window. Second best option is middle row so it's only your travelling companion/partner who has to stand to let you out. Best option, and the one we've chosen for QF63 that is not far off as long of a flight, is the very last row, a row of two. Loo proximity doesn't bother us.
