The amount set up in your coin reserve is withdrawn on the 27th of every month. On days that banks are closed, this withdrawal will occur the next business day.
For example, if your reserve amount is 10,000 yen a month, 10,250 yen will be withdrawn from your financial institution on the 27th of each month (this includes the 2.5% handling fee) and added to your reserve capital.
A per-diem amount based on this withdrawal will be spent on purchasing virtual currency daily from the 10th of the following month until the 9th of the month thereafter. This schedule is also published in the following article: Zaif Coin Reserve Introduction.