The two options are measured in different units
Most people weigh up delivery options by price and speed alone. On a certified translation for United States paperwork there is a subtler difference worth noticing: the standard option is counted in business days and the express one is counted in hours. Those are not the same kind of measurement at all.
A count in business days is a count of working weekdays, so it pauses whenever the working week pauses. A count in hours does nothing of the sort; it runs on through an evening and on through a weekend. Begin the same job on two different days and the two options can trade places.
English is what the file has to be readable in
Documents used in the United States have to be readable in English, so a certified translation into English in Sunderland is what any item in another language calls for. The original keeps its own wording and its own language, and the English pages accompany it rather than standing in for it.
The language itself does not move the clock. Whether a foreign record runs short or long, the same standard and express options are on offer, and it is the number of sheets carrying text that pushes a job from one day into the next.
The certificate, and why it adds no waiting
The certification is a certificate of accuracy, signed by a certified translator and attached to the English pages. It is made as part of the work rather than fetched from elsewhere afterwards, which is why a signed set is ready at the end of the very clock the translating ran on.
No sworn standing is called for on this route. Nobody has to be tracked down in a particular register before a signature can be given, so a certified translation in Sunderland for United States files is bounded by reading and typing rather than by anyone's diary.
Per-page cost and turnaround
Work is priced at about £25 per page, over 2–3 business days as standard, with a 24-hour express option. The count follows the sheets that carry text, so a thicker file moves the total without touching the rate, and the clock you pick is a separate decision from the one about pages.
An official English translation in Sunderland begins sooner when the source is already to hand. Sunderland Registration Service prints fresh certified copies of civil entries at City Hall on Plater Way, and that step sits outside both clocks, which is precisely why it is worth doing first.