Learn English – “to” vs. “until”

It should be until the end of time. The time here is referring to the entirety of time itself, from the Creation until the end of the world, perhaps. Time here is not countable, so you cannot use times.

Both are valid, but imho the numerical format is more succinct and stands out from the surrounding text.

Consider this sentence:

During my holiday trip, I will spend just 1-2 nights in London followed by 10-15 days touring the rest of Europe, and return by 28th or 29th.

Or some (made up) recipe:

• 1-2 finely chopped onions

• 3-5 tsp flour

• Few pinches of salt

In both these, I think writing out the numbers in long hand will make it excessively verbose.

As a counterexample, consider the lumber size 'two by four' , representing it as '2 x 4' may take a bit of processing for people who parse 'x' symbol as 'into/multiplied by'. However, when a smaller number is followed by a larger number and separated by '-', it's common to read the symbol as 'to' (unless it's in a mathematical sense).