Our tour started at 12 but we had to meet at 1130 so everyone could be picked up. Sonoma was recently out of power because of the potential for wildfires caused by down power lines. So instead of being able to get lunch in Sonoma, we picked up food at a Whole Foods before we left town. Fast forward to 1:30/1:45 and we finally made it to our first winery, Jacuzzi. After the first wine tasting, we were able to take 30 minutes or so to walk around the vineyard which was nice. Afterwards, we went to Homewood Winery which is VERY small. We were able to eat our lunch during the wine tasting but there wasn't much to do there so we got back in the van for the ride home. On the way back, we stopped to get pictures with the Golden Gate bridge. We were supposed to get back close to 5pm but didn't get dropped off until 545 and we were the first to get dropped so I'm sure it was later for the others.
Overall, I'd say the trip was a little expensive for what we got. We were only actually at wineries for 2.5-3 hours and the whole trip was over 6 hours.