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docs: understand your setup size fix formula

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Signed-off-by: Artem Navoiev <tenmozes@gmail.com>
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docs/guides/understand-your-setup-size/README.md
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@ -76,7 +76,7 @@ The typical distribution between light vs heavy queries is 80%:20%. So when you
### Retention Period/Disk Space
The Retention Period is the number of days or months you store the metrics. It affects the disk space. The formula for calculating required disk space is **Replication Factor * Datapoint Size * Ingestion rate * Retention Period in Seconds + Free Space for Merges (20%) + 1 Retention Cycle**.
The Retention Period is the number of days or months you store the metrics. It affects the disk space. The formula for calculating required disk space is **Replication Factor * Datapoint Size * Ingestion rate * (Retention Period in Seconds +1 Retention Cycle(day or month)) * Free Space for Merges (20%) **.
The Retention Cycle is one day or one month. If the retention period is higher than 30 days cycle is a month; otherwise day.