When should I do a 3rd rabies shot, my 2nd got delayed (pre-exposure)?

I did my first verorab rabies shot (day 0) but then had to unexpectedly go abroad so I wasn't able to do my 2nd shot earlier than day 18. I know that verorab rabies shots are either 2 or 3 shots, I want to do a 3rd one since 2nd got delayed, when should I do it? The general guide was day 0, day 7, day 21 or day 28. Should I leave 2 weeks between the 2nd and 3rd (but then the 3rd one would be on day 32). Or is a bit less than 14 days between the 2nd and 3rd also fine (let's say 10 days so it would be on day 28)? Which one is more important, for the 3 shots to be done in the span of 28 days or that 2nd and 3rd to have at least 14 days inbetween?

I have read the FAQ.