As the kids get older and if serious about soccer, I know several players/families have made the trip. And not just distance but traffic direction and time involved.
Player 1 - Santa Clarita to Chino Hills 2x week
Player 2 - Rancho Palo Verdes to Chino Hills 2x week
Player 3 - Laguna Beach to SD Polo Fields 4x week
Player 4 - El Toro to Fairplax 2x week
Player 5 - Cerritos to Great Park 2x week
Player 6 - El Segundo to San Juan Capistrano, then Costa Mesa and now Woodland Hills 4 week
One in particular, prior to LAGDA started boarding HS program, commuted 4x week from Palm Desert to Carson.
Its a value proposition that only the player and his/her family can make and justify. There simply is no way to generalize what's acceptable and what's not in terms of distance and time.
My son was offered a spot on a top-level team (Presidio Premier), but we said it was too far away - 22 miles. However, we did go over occasionally to practice for guest spots in tournaments, so it was close to the limit.