Also, *where the hell* are these people living that they can't get there and back in 6 hours? It must be a real bitch to spend 3 hours getting to work and 3 hours getting home
You have clearly not experienced Silicon Valley traffic.
For starters, in most of the Valley, you're looking at half a million dollars minimum to buy a house, and if you're in the nice bits like Palo Alto or Menlo Park or Mountain View, then you're either looking at a rabbit hutch or the wrong side of a million dollars (or both, in some cases). Rental for a family-sized house or apartment is probably a couple of thousand dollars a month minimum, and there's quite a bit of competition for what's available. I know a few people who live out towards Modesto, which is 80-90 miles away and therefore 90 minutes drive even with no traffic (apart from cops with speed guns encouraging you to take 90 minutes and not 60). Various highways, 85, 101, 880, 237 etc, all put the M25 to shame when it comes to imitating a car park, so that last 20-30 miles can easily take over an hour.
So, if you can't afford to live in the Valley itself, you're stuck living some distance away and yes, of that six hour gap you could be driving for at least four of the hours. There are probably dire consequences for failing to be there on time for the evening pick-up, so you've got to allow for contingencies. The morning/evening trips to home may be relatively OK, but if you've got to get to the bus garage to get your bus, then drive it to your pickup area, all as traffic is increasing for the rush-hour, the necessary start time gets earlier and the final end time get later.