2

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
3

"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.

2

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.

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