Some of the important factors when doing long drives are the nature of the road and the scenery , whether the drive is mainly on major FWYs or the 2 lane byways, the topography and then rest stop facilities, gas stations, food, etc. I think that weather and road conditions are the most crucial factors.
Personally speaking with Cali being a long arse state with all kinds of diverse topography and sceneries, from south to north, I have easily done 500-600 miles one way trips in the past although I do not do these trips as often these days (same with going a bit east ward in to AZ and NV although thru more mundane roads). I once drove the 1100 miles from San Diego to So. OR in one day which was quite rough and I definitely would not recommend. Funnily enough. I also drove similar distant, two way trip to the Bay Area in one day many years ago which did not bother me as much, but I was quite a bit younger back then. These trips were solo, not co-pilots.