Here I will do it for you again, so maybe this time you will get it.
1260 days + 3 1/2 days + 1256.5 days = 2520 days.
The bible use 42 months as a nominal way of saying 1256.5 days. So....
1260 days + 3 1/2 days + 42 months (which are not exactly 1260 days, but 1256.5 days) = 2520 days
|------------1260 days - ----------7th trumpet-----------1260 days--------------|
7th seal--------1256.5 days-------7th trumpet-----------1260 days --3.5 days--|
7th seal begins the 70th week.
7th Trumpet marks the midpoint
7th vial ends it.
Daniel is told to measure the temple. What time is it? What day of the 2520 days is it?
I submit that it is on the 1256.5 day. The city is to be trampled for 42 months starting at the time of this verse:11:2. Then immediately (11:3) the two witnesses show up. Their time will parallel the 42 months time. Then, 3.5 days later, the man of sin will enter the temple and the daily sacrifices will cease: the abomination!
The 7th trumpet will sound in heaven marking the exact midpoint of the week.
Almost instantly, perhaps a second or two later, those living in Judea that know to run, will begin to flee (12:6) (1260 days of fleeing) and at the same time, Michael, who has been waiting for this moment for a very long time, will go to war with Satan to cast him down from the heavenly realms. The time? It is still very close to the 7th trumpet midpoint.
John gives us 6 parallel paths down the last half of the week.
1. The 42 months of trampling
2. The 1260 days of witnessing
3. The 1260 days of fleeing
4. The 3.5 years of protection and feeding
5. The 42 months of authority
6. John's narrative in chapters 11 on to chapter 16 and the 7th vial that ends the week.
On day 1256.5 of the last half of the week, the 1260 days of witnessing will be finished and the two witnesses will be killed. For 3.5 days they will lay dead. Then, at the 7th vial, they will be raised up and will be seen to rise. But at the same time, but probably invisible, all the Old testament saints will rise.
Note: all five parallel paths down the last half of the week will NOT begin on the same day. It will be a staggered beginning with the man of sin showing up in Jerusalem 3.5 days before he will enter the temple.
The last start (and the last finish) will be the 42 months of authority given to the Beast. He will not be caught until some time AFTER the 7th vial ends the week. Jesus does not return at the 7th vial. It may be 30 days later that Jesus returns. The marriage and supper must wait for the Old Testament saints to arrive as guests. That is why John does not mention the marriage until chapter 19.
It is not difficult if we just take John at his word and don't try to rearrange what he has written.