- Increased base time per frame for all models (2-4x more realistic)
- Added LTXVideoPipeline specific estimate (4.0s/frame)
- Increased model loading times (90s-10min based on model size)
- Added realistic image model loading times for I2V mode
- Added image generation time based on model type (Flux, SDXL, SD3)
- Added 30% overhead for I/O and memory operations
- Added 20% extra time for I2V processing
- Increased resolution scaling factor to 1.3 (quadratic relationship)
- Increased download time estimate to 15s/GB with 2min cap

The previous estimates were too optimistic and didn't account for:
- Full diffusion process (multiple denoising steps)
- Model loading from disk/download
- Memory management overhead
- I2V-specific processing time
- Image model loading for I2V mode