Limits for sandbox environments:
A sandbox is a copy of your organization in a separate environment, you can use for a variety of purposes, such as testing and training. Sandboxes are completely isolated from your Salesforce production organization and operations you perform in your sandboxes do not affect your Salesforce production organization.
The following limits apply to sandboxes.
You can refresh a Full sandbox 29 days after you created or last refreshed it. If you delete a Full sandbox within those 29 days, you need to wait until after the 29 day period, from the date of last refresh or creation, to replace it.
You can refresh a Partial Copy sandbox 5 days after you created or last refreshed it. If you delete a Partial Copy sandbox within those 5 days, you need to wait until after the 5 day period, from the date of last refresh or creation, to replace it.
You can refresh a Developer or Developer Pro sandbox once per day.
Enterprise Edition includes a license for 1 Developer sandbox.
Performance Edition includes licenses for 1 Full sandbox, 1 Partial Copy sandbox, 5 Developer Pro sandboxes, and 30 Developer sandboxes.
Unlimited Edition includes licenses for 1 Full sandbox, 5 Developer Pro sandboxes, and 15 Developer sandboxes.
If you need licenses for more sandboxes, contact salesforce.com to order sandboxes for your organization.
The following limits apply to Sandbox storage limits.
Partial Copy sandboxes have a 5 GB of files and a 5 GB of data storage limit.
Developer Pro sandboxes have a 1 GB of files and a 1 GB of data storage limit.
Developer sandboxes have a 200 MB of files and a 200 MB of data storage limit.
Full sandboxes have the same storage limit as your production organization.
*Sandboxes don’t send email notifications when storage limits are reached. However, if you reach the storage limit of your sandbox, you can’t save new data in your sandbox. To check your storage limits, from Setup, click Data Management | Storage Usage in your sandbox.
Cheers!!!