The respective descriptions of time sequences (forty-two months, 1,260 days, and Time, Times & Half) appear to be synonymous. That is, parallels seem to appear when the end time is "rolled out," which appears to be Daniel's scroll that had been sealed until the end time (Daniel 12:9). The end time of Revelation is therefore one scroll - please click herehere.
The diagram, below, attempts to illustrate these parallels, which appear upon the plain and normal reading of the text. The references in red have no known placement because of lack of specificity in the text, and therefore appear as suggestions (and thus annotated with a question-mark).
Thus the scroll is "rolled out" and depicts various events, but not in chronological order. The appearance of characters (the beast, the Lamb, the woman, etc.) in the narrative provide reference points, which enable the reader to place the parallels in tandem with the time sequences.
In summary, the descriptions of the time sequences (forty-two months, 1,260 days, and Time, Times & Half) therefore appear synonymous in meaning with regard to extent of time. If these times sequences are synonymous in meaning, then the parallelism in the Revelation appears stronger.
In summary, the "end time" before the visible appearance of Jesus Christ to earth appears as a period of seven years comprised of two segments, which are 3.5 years each.