Correct, y'all, and I'd like to add a coupla things...
Victory, i've run crops a few ways, and in every case but one, the same plants were finished sooner when run hydro. Less veg time, more vigorous plants overall, and yeah, a few days to a week faster in flowering. Over the course of a year or more, that's major time savings that add up to possibly another whole crop or more per year than you would have gotten otherwise.
G4G, lately folks in my neck of the woods have been referring to anything NOT soil as "hydro." In MY world, "hydro" means a flood and drain system on timers, but I guess that's not how everybody sees it. It's confusing. I'm top feeding a soilless mix atm, and folks round here would call it hydro, tho I would not...so now, whenever this comes up, I have to explain what I mean when I say "hydro" so that we're on the same page.
I have my plants in 2 gal pots of a coco based soilless mix, sitting on flood and drain tables. Soon, they'll be hooked up to pumps and the tables will be flooded and there'll be no more top feeding. So this will be a soilless/hydro setup. The soilless mix I'm using has very good drainage and needs to be watered at least once a day; I think of it as an organic rockwool cube. The reason I'm using soilless and not rockwool is that I HATE taking carloads of rockwool to the dump, wrapped in plastic, where they will sit, completely unaltered, until judgement day. It's a damn environmental catastrophe. My soilless mix, however, when I'm done with it, will be tilled into the garden where it will continue to be useful. Even if you don't have a garden to put it in, you can feel mostly OK about simply dumping it into a hole in the yard and covering it up. Check that hole on J-day: it will have long since broken down into dirt; sweet, useful, natural dirt. So perhaps in some cases the lack of commercial hydro growers can be chalked up to at least a minimum level environmental consciousness.