Well, you just answered your own question, once a month, you have your period. it usually will be in the same time as you started, For Ex: if you started Aug. 1st, then you next period will be around Sep. 1st.
Usually within one month but it can be as long as two months.
Luna, Earth's Moon takes one month to turn once on its axis. That is why we use the word, "Month" (from the very old word, "Moonth") to describe that period of time.
No normally your period should only come once a month but if your period has just started then they usually take a while to settle into a pattern. If it continues you should visit a doctor.
The period of rotation for Venus is 243 days.
The moon spins once on its axis every month; one sidereal period around earth is equal to one complete rotation on its axis. If the moon did not rotate, all of its surface would be visible from earth over the course of a month.
Chimps have an 8 month (240 day) gestation period.
pregnancy lasts one month
You are born with all the eggs you will ever have. One of them a month is released by your ovraies.
cat 3 month, dog 4 month, haha, Chinese saying.
There is no hard and fast rule. Usually you can only get traffic school once in every 12 month period.
Usually 2-3 months.
The orbital period of Halley's Comet is about 75.3 years.