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.
Try to answer this question if possible (otherwise reply "unanswerable"): How many months can it take for intervals to become available?
unanswerable