When did the last of the High Elves leave Middle Earth ?

[Inziladun]

Originally Posted by The Mouth of Sauron

So did they all sail eventually ?

My feeling is that all did not. The Silvan Elves had not heard the Sea's call, and they seemed quite content to continue on in their forest realms as long as they could. As a comparitively simple and rustic lot, probably some of them were uninformed as to their ultimate fate in ME if they remained.
This ties into the Círdan question. If all Elves did not eventually sail into the West, either because of conscious refusal or ignorance of their plight, how would Círdan know when the 'Last Ship' was to sail? How long would he wait for the last two or three to make up their minds before finally deciding they were a lost cause, and leaving himself?