Revelation has 42 months and 1260 days. 3,5 years plus 3,5 years equals 7. Some believe its just 3,5 years, alright, however you want to interpret it, it is a short time period, the time of Jacob's trouble at the end right prior to the second coming.
I interpret those time periods in the same manner as Daniel's 'seventy sevens'. In other words, they must all utilize the same 'day/year principle', otherwise the prophecies don't work.
Most people 'flip-flop' between days and years in order to make their theories work. Daniel does not allow for those kinds of 'mental gymnastics' so to speak.
In other words, 1260 days become 1260 years. 1290 days become 1290 years. 1335 days become 1335 years, and 2300 days become 2300 years. Once Daniel and Revelation are interpreted with day/year principle in mind, everything lines up simply and beautifully. In other words, it all points to the finished work on the Cross. It's all about Jesus.

