Reading list: How long does the upscaling process usually take?
The time it takes to upscale old wedding videos to 4K depends on several factors, but here’s a clear general estimate:
For a short clip (a few minutes): It can take 5–20 minutes on a standard computer.

For a longer video (20–60 minutes): It may take 30 minutes to a few hours.

For very long footage (1+ hours): It could take several hours or more.

The actual time varies based on:
Tool/Software Used – Some tools are faster or more optimized than others.

Computer Power—A stronger CPU/GPU speeds up the process.

Video Resolution & Length – Higher resolution and longer footage take more processing time.

Settings You Choose—Higher quality upscaling and denoising increase processing time.

https://eternaedits.com/ai-enhanced-wedding-films-upgrade-your-old-footage-to-sharp-4k-quality/