What kind of problems can occur because of eventual consistency?

How many seconds are required for the data to be consistent?

For example lets say I have an application that lists a special kind
of items. (a simple query, special kind of items out of all items)
When a new item is marked as special, the application will not
instantly list that item as special, right? So is this eventual
consistency? (the query will not include the new item as a result)
When will the application list the new marked item as special? (It
should eventually happen but when?)

Are there other problems that I can't think of? The above situation is
not really a problem for me if the consistency is established in 1-10
seconds.

Thanks in Advance

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