Ok, we got

everyday: day 1 (on), day 2 (on), day 3 (on), day 4 (on), day 5 (on), etc

Ex: we eat soup everyday

every other day / every second day: day 1 (on), day 2 (off), day 3 (on), day 4 (off), day 5 (on), etc

Ex: we eat soup every other day

Ok, now I want it as followings:

0-12h of day 1 (on), 13-24h of day 1 (off), 0-12h of day 2 (off), 13-24h of day 2 (on), day 3 (off), 0-12h of day 4 (on), 13-24h of day 4 (off), etc.

How to express every 1.5 days?

  • 6
    You just said it: every one and a half days; alternatively, every day and a half. ... Note by the way that everyday is an adjective; in your context you must use every day. – StoneyB on hiatus Feb 27 '17 at 13:28
  • 2
    Another possible way to say it: every 36 hours. – Damkerng T. Feb 27 '17 at 17:31
  • Every "day and a half" would be a common way to express it. – fixer1234 Feb 27 '17 at 22:43

"Every day-and-a-half", or "every one and a half days", or "every 36 hours".

In some cases "every one-point-five days" is also acceptable.


It's dependent on context.

In casual conversation, one might say "a day and a half" or "one and a half days". However, in a scientific paper for instance, "1.5 days" or "36 hours" may be used instead.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.