Temporary working, files also known as cache files. When they're done, they're gone.
For future reference, memory is RAM. Disk space is storage. They are not directly related but they are often confused.
You're trying to Warp Stabilize THIRTY MINUTES OF VIDEO? You're really pushing the envelope!
Warp Stabilizer is intended to stabilize selected individual shots, not an entire program! Jeez!
If I were you, I'd come up with a Plan B where you Warp Stabilize only what is absolutely necessary.
Or here's an even better idea: if this is actually 30 minutes of shaky shots, go reshoot your video properly and stop using AE as a crutch for poor photography.