I think (just based on this) that if the perfect conditions exist, tomato plants must be able to grow for a very long time. There's the world record tomato plant at Disney in Florida. I know it's several years old. Here's a link to a photo of it:

http://farm2.static.flickr.com/1272/857819226_3a3948974f_o.jpg

And one more:

http://farm2.static.flickr.com/1400/857819240_2c85fb4f13_o.jpg

Judy

Here is a link that might be useful: Ft2Garden.com

WOW!! Does Disney have a continuous water/nutrient supply to that small pot? That is one amazing plant.

Tomatoes do not set fruit well when daytime temps exceed 90F or nighttime temps exceed 70F. Perhaps a cooler night temp would help yours.

Here is a link that might be useful: Fruit set factors

I have a floragold basket tomato from last spring in the greenhouse with a tomato on it right now. Seems like they can live forever if they don't get something wrong with them. It grew in a yogurt cup all last summer and recently I felt sorry for it and put it in a bigger pot.
I carried over a few Red Robins last winter and they were still fine in the spring. I've only tried with some of the mini varieties though, because who has space for a big one?

Disney has space for a big one! :) I'd love space for a 'big one'... :) That is one big tomato plant... I can imagine myself in a beach chair under that tomato tree munching on tomatoes! :) What a lovely thought.

I think the folks above are right on - under optimal circumstances ind toms will just keep going. What zone is Wayne growing in - ? I recall a recent thread where someone was having blossom drop...

yep. a salt shaker and a cold beer....