Whole-project estimator
How long will this box of memories take?
Scanner speed is one line in the budget. Dusting, sorting, handling, correction, naming, checking, and backup are where the “weekend project” starts telling on itself.
Measure ten before promising a finish date
Run a mixed ten-item sample using the exact workflow. Replace every guessed per-item time with the measured average, and plan fragile exceptions separately.
This is a planning model, not an industry speed claim. The workflow stages follow the National Archives family-digitizing guidance; the ten-item sample is how you replace our defaults with your own measured pace.