You need to have some interpretative reason that I am talking about my days in order to reasonably multiply what I write by 29 . My faith is that the future events will precisely fulfill God's words, without our having to do a fudge factor. Let me give another example of the need to precisely read God's words. There is the issue of when the 70 'sevens' begin. But this decree does not have a command to build anything.
People quote it as a decree to rebuild Jerusalem.
Then I point out there is no mention of building or Jerusalem in the decree. It's a decree for supplies to the temple that has already been completed. At this point people start pointing out all that was accomplished as a result of the decree. The numbers work out very nicely from 457 BC till the crucifixion. People see the numbers working out, so it's assumed to be the right one and the twisting of God's Words begins.