now I checked it is even 90 days if you dont buy a 25 TB plan.
it means that you pay them for 90 days more for the deleted content.

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Hi Dr. Cem, 

 Wasabi does have a minimum 90-day storage retention period that means stored objects that are deleted before they have been stored with Wasabi for 90-days will incur a pro-rated charge equal to the storage charge for the remaining days (see FAQ#6 for more details). 

This policy is comparable to the minimum storage charge period applicable to some of the AWS and other object storage services, which results in Wasabi still being 80% less expensive than other storage solutions.

I know we spoke about Reserved Capacity Storage in the past. This plan will allow our 90 day retention period to be dropped down to 30 days. Let me know if you want more information. 

Best,