Timeline duration is not an export-speed guarantee. Measure a representative sample with the actual output settings, then extrapolate cautiously. A complex section, startup overhead or thermal behavior can make a short sample unrepresentative.
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What the exporter has to do
| Stage | A question to investigate |
|---|---|
| Read and decode | Are the sources accessible and efficiently decoded? |
| Process | Are effects, resizing or compositing expensive? |
| Encode | Does the chosen output path match the required quality and format? |
| Write | Is the destination available with enough capacity? |
An export can be dominated by one stage. Switching to hardware encoding is not guaranteed to help if an effect chain or unsupported source decoding is the main cost. See decode, effects and encode before changing several settings at once.
A transparent estimate
If a 60-second sample takes 45 seconds to export, its export-to-timeline ratio is 0.75. Applied to a ten-minute timeline, a simple extrapolation gives 450 seconds, or 7.5 minutes. If you choose an assumed variation of 20% either side, the illustrative range is 6–9 minutes.
That range is a planning assumption, not a statistical confidence interval. It is not a measured benchmark for any named GPU or editor. Enter your own measured sample in the export time estimator.
Make the sample more useful
- Include a section with the normal effect and source mix.
- Use the final resolution, rate-control mode and audio layout.
- Record when you start and stop timing; include or exclude startup consistently.
- Avoid comparing a cold first run against a heavily cached repeat without noting it.
- Measure a second sample if another part of the program is much more complex.
- Reserve deadline margin and verify the full output.
When the estimate is least reliable
Very short clips emphasize startup overhead. A sample with no effects says little about an effects-heavy ending. Long exports can encounter a different temperature, storage or background-workload condition from a one-minute trial. A reused preview may change the work performed; document that path.
After export, do the delivery check
Reopen the result, confirm duration, dimensions, audio and the critical sections. Finishing quickly is only one requirement. A corrupt or incorrect file still needs another export, so account for verification time when planning a deadline.
Sources and scope
The timing figures are worked arithmetic examples. No physical machine or application benchmark was performed for this guide. Sources checked October 6, 2026.