If the BEF had not been evaculated from Dunskirt during WW2, will the war been ended after much later?

Answer 1

"THE French had collapsed. The Dutch had been overwhelmed. The Belgians had surrendered. The British army, trapped, fought free and fell back toward the Channel ports, converging on a fishing town whose name was then spelled Dunkerque.
Behind them lay the sea.
It was England’s greatest crisis since the Norman conquest, vaster than those precipitated by Philip II’s Spanish Armada, Louis XIV’s triumphant armies, or Napoleon’s invasion barges massed at Boulogne. This time Britain stood alone. If the Germans crossed the Channel and established uncontested beachheads, all would be lost, for it is a peculiarity of England’s island that its southern weald is indefensible against disciplined troops........
Now the 220,000 Tommies at Dunkirk, Britain’s only hope, seemed doomed. On the Flanders beaches they stood around in angular, existential attitudes, like dim purgatorial souls awaiting disposition. There appeared to be no way to bring more than a handful of them home. The Royal Navy’s vessels were inadequate. King George VI has been told that they would be lucky to save 17,000. The House of Commons was warned to prepare for “hard and heavy tidings.”
Then, from the streams and estuaries of Kent and Dover, a strange fleet appeared: trawlers and tugs, scows and fishing sloops, lifeboats and pleasure craft, smacks and coasters; the island ferry Grade Fields; Tom Sopwith’s America’s Cup challenger Endeavour; even the London fire brigade’s fire-float Massey Shaw — all of them manned by civilian volunteers:

English fathers, sailing to rescue England’s exhausted, bleeding sons."

Answer 2

And following on from the first answer, what exactly are you asking? Are you suggesting that had the BEF not been evacuated the war would have lasted longer? It might have finished sooner, had Hitler decided to invade a Great Britain reeling from the loss of an army. It might not have made any difference if he had still tried to knock out the RAF, leading to the Battle of Britain which he lost.