A method that works nicely if things come together well is to have one driver drop off a cyclist or two, then pick them up on the way home. Takes a lucky linkage of time. Even if it only works one way, saves time. If you're 30 miles each way, that's a chunk of time. About at the distance where careful increases in speed start to add up. Difficult in commuting mode, more the performance mode. Commuting mode, 3 hours each way. Performance mode, only 2 hours or less. I'd only consider 30 miles each way if flat and I could ride a semi-faired recumbent. I can make one of those fly on the flat! Just can't get one up hills.
But take 10 miles off in each direction by a pickup - dropoff system and it's only 20 miles each way - very doable.
I used to work the dropoff system - but a bit different. I'd do the final part of the commute alone on a tandem, pick up the stoker on the way home. Will get one rather strong rather fast!