I opened a project in the track view, with 30 odd tracks, all audio, with various plugins and found that it had grown in length by over an hour. What was a 4 minute song is now 1 hour 10 mins. The audio is still 4 mins long, but the project isn't. How can I knock off an hour from the track lengths?.  Because they is no audio in this hour long zone at the end of each track, the tracks cannot be cut. I'm running X2a on Windows 7 Ultimate with a 4core AMD processor and 8gig RAM. Anyone help please?

Look for any events that extend beyond the end of where the end of your project is supposed to end.
 
Also, I would think you could select all tracks, set the Now Time to the correct ending spot for the project, select Edit>Select>From = Now, and this should select all track contents from that Now Time to the end of the project, which should go away if you delete.
 
Please note that you should back up everything first, prior to trying the above.
 
Bob Bone
 

Sometimes an automation node will swim downstream for no reason and make your project think the ending is at the rogue automation node.  I've had this happen in this past. 

Thanks fellas, I'll have a look at any automated noteds. I do use volume and pan envelopes in a big way. It could be that a node has found its way down the road. I also used the "select Edit>Select>From = Now" feature but I didn't delete anything.
Is a Swedish fish colder than an English fish. I have a cat that won't leave. It used to be my tape op, but when I got rid of the the tape machines, he refused to budge. Makes good coffee though.

Loadsa rogue nodes even nodes on the buses. That was the problem. How they got there, , who knowds. Thanks fellas for pointing me there. This forum is at its best when problems are solved. "Nodes On The Bus" , sounds like an album title to me

This sort of thing has happened to me before, so don't sweat it.
 
38 years ago, I turned my very first professional computer program over for testing.  The manager literally swept his hand across the keyboard, and my program promptly freaked out and pushed up the daisies, as I had NO idea that data entry folks would possibly enter data that was bad.
 
I have never forgotten that lesson.
 
When weirdness in a project happens, like what happened to you, I immediately begin looking for rogue events, as the most likely cause of the trauma.  Plugins and settings would be the next likely sources of weirdness I usually examine, depending on the nature of the weirdness.
 
Glad you have things back to the normal level of trauma.  :)
 
Bob Bone
 

Thanks Bob. I know we all moan about PC's Applemacs and the like, but I don't ever need to use a razor blade again. Imagine reversing a track on a multitrack machine. Though I did witness that once.

Peter Morrison
...I have a cat that won't leave. It used to be my tape op, but when I got rid of the the tape machines, he refused to budge. Makes good coffee though.

Congratulations, this one made it into my "memorable forum quotes" collection. I should really post that collection someday. It contains years of entertaining forum gems, some brilliant wit along with some profound stupidity.

Bitflipper, they took away my razor blade, in fact, every sharp and now I'm left with a box that calls itself a brain. My PC. There was a famous English comedian in his 50's called Bob Monkhouse who said, "When I was a kid, I told my school friends, when I grow up I'm gonna be a comedian. They all started laughing. Ha! they're not laughing now." 
The past is constant and in my opinion, a glimpse into the future is best left to scientist and God people.
My cat's coffee makes me think like this, but David Crosby said "Music is the best thing you can do, that doesn't require removing your clothes."

David Crosby even figured out how to procreate without removing his clothes.