Please period came out 30th of August then 25 of...

What is normal period ?
The normal period occurs every 28 days ( the average is between 21-35 days) and this is considered within the normal range
How many days should the period remain ?

It remains between 2-7 days as the normal average
How to know you period ?
You should use calender to set up the first day of your period and then the possible time of ovulation and finally the next period and calculate the days btween the first and second one
About your period ?
If the first day in your last period was in 30/08/2020 and the recent period started in 25/09/2020, then your period occurs every 25-26 days which is considered normal