The solution of the difficulty is to be found in the lines quoted above.  The marriage followed, within a month, not the death of Hamlet’s father, but the funeral.  And this makes all clear.  The death happened nearly two months ago.  The funeral did not succeed it immediately, but (say) in a fortnight or three weeks.  And the marriage and coronation, coming rather less than a month after the funeral, have just taken place.  So that the Ghost has not waited at all; nor has the King, nor Laertes.

On this hypothesis it follows that Hamlet’s agonised soliloquy is not uttered nearly a month after the marriage which has so horrified him, but quite soon after it (though presumably he would know rather earlier what was coming).  And from this hypothesis we get also a partial explanation of two other difficulties, (a) When Horatio, at the end of the soliloquy, enters and greets Hamlet, it is evident that he and Hamlet have not recently met at Elsinore.  Yet Horatio came to Elsinore for the funeral (I. ii. 176).  Now even if the funeral took place some three weeks ago, it seems rather strange that Hamlet, however absorbed in grief and however withdrawn from the Court, has not met Horatio; but if the funeral took place some seven weeks ago, the difficulty is considerably greater. (b) We are twice told that Hamlet has ’of late’ been seeking the society of Ophelia and protesting his love for her (I. iii. 91, 99).  It always seemed to me, on the usual view of the chronology, rather difficult (though not, of course, impossible) to understand this, considering the state of feeling produced in him by his mother’s marriage, and in particular the shock it appears to have given to his faith in woman.  But if the marriage has only just been celebrated the words ‘of late’ would naturally refer to a time before it.  This time presumably would be subsequent to the death of Hamlet’s father, but it is not so hard to fancy that Hamlet may have sought relief from mere grief in his love for Ophelia.

But here another question arises; May not the words ‘of late’ include, or even wholly refer to,[250] a time prior to the death of Hamlet’s father?  And this question would be answered universally, I suppose, in the negative, on the ground that Hamlet was not at Court but at Wittenberg when his father died.  I will deal with this idea in a separate note, and will only add here that, though it is quite possible that Shakespeare never imagined any of these matters clearly, and so produced these unimportant difficulties, we ought not to assume this without examination.

FOOTNOTES: 

[Footnote 250:  This is intrinsically not probable, and is the more improbable because in Q1 Hamlet’s letter to Ophelia (which must have been written before the action of the play begins) is signed ’Thine ever the most unhappy Prince Hamlet.’  ‘Unhappy’ might be meant to describe an unsuccessful lover, but it probably shows that the letter was written after his father’s death.]