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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?
"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.
