Is "right up to" or "until as late as" more formal as a phrase in a book?

Question

The entire sentence is: "the discovery of the stoneware demonstrates its need right up to / until as late as the 9th century."

should i replace 'right up to' with more formal words or is it ok?

Answer 1

Both are too wordy. "The discovery of the stoneware demonstrates its need until as late as the 9th century."

Answer 2

the discovery of the stoneware demonstrates its need up into the 9th century

Answer 3

I think right up to does sound more casual, but it's fine. "Until as late as" is a bit of a mouthful. Personally, I'd go for "until as recently as the 9th century"- just sounds nicer...

Answer 4

The problem comes down to the tone. If you are talking to your reader then a more casual phrase like 'right up to' is fine, how ever if you are lecturing or instructing you reader then a more formal phrase is needed. Hope this helps.