Open Stack

hello All,
               I have very limited number of floating ips ,and while
testing i used all of them and then disassociated that from instances.
Now the issue is i no longer can associate those ips to any instance
whether in that tenant or for other tenants.

In the db under "project_id" entry i can see  tenant id of my tenant.
how will i reuse these ips for other tenant or for other instances from
same tenant.Any time out that we can set for releasing ip from a tenant
which are not associated to any instance?
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