The Magic Mountain by Thomas Mann

And now we are confronted by a phenomenon upon which the author himself may well comment, lest the reader do so in his stead. Our account of the first three weeks of Hans Castorp's stay with "those up here" -- twenty-one midsummer days, to which his visit, so far as human eye could see, should have been confined -- has consumed in the telling an amount of time and space only too well confirming the author's half-confessed expectations; while our narrative of his next three weeks will scarcely cost as many lines, or even words and minutes, as the earlier three did pages, quires, hours, and working-days. We apprehend that these next three weeks will be over and done with in the twinkling of an eye.

Which is perhaps surprising; yet quite in order, and conformable to the laws that govern the telling of stories and the listening to them. For it is in accordance with these laws that time seems to us just as long, or just as short, that it expands or contracts precisely in the way, and to the extent, that it did for young Hans Castorp, our hero, whom our narrative now finds visited with such an unexpected blow from the hand of fate. It may even be well at this point to prepare the reader for still other surprises, still other phenomena, bearing on the mysterious element of time, which will confront us if we continue in our hero's company.