Context: Snapshots usually become available more than six months after they are archived or, in some cases, even later; it can take twenty-four months or longer.  The frequency of snapshots is variable, so not all tracked web site updates are recorded. Sometimes there are intervals of several weeks or years between snapshots.

Question: What are the saved versions of a site called?
Answer: Snapshots

Question: What is the minimum amount of time that elapses before most snapshots are released for viewing?
Answer: six months

Question: What term characterizes the rate at which snapshots are made of websites?
Answer: variable

Question: What are the saved versions of an update called?
Answer: Unanswerable

Question: What is the minimum amount of time that elapses before most snapshots are released for recording?
Answer: Unanswerable

Question: What term characterizes the rate at which intervals of websites are made?
Answer: Unanswerable

Question: How many months can it take for intervals to become available?
Answer: Unanswerable

Question: How long are intervals between cases?
Answer: Unanswerable