Could be wrong but I feel that's more than an hour east especially when you account for traffic - at least the cities that are actually inexpensive. Dublin, Pleasanton, and Livermore are no longer inexpensive cities with cheap real estate. Neither is Alamo and other nearby cities.

So the problem with living beyond Pleasanton is that you will spend most of your life sitting in traffic. Why do you need to sit in traffic? Because almost all the jobs are in the Bay Area. Maybe that won't be as big of a problem soon though once you have Level 4 autonomous driving. Personally I still wouldn't go for it with that.

Barely and only without traffic. It's over an hour to Tracy now without traffic and that's right on the Western edge of the central valley. Places "deep" in the valley like Stockton out Manteca are even further.