Now, for the sake of simplyfying things, I'll divide the type of blog posts in two categories; days where a veteran is shown and days where there isn't.
There are a total of ALL veterans coming to Ultimate. In other words, 65.
But it's not exactly 65 posts we'll get, because Pokemon Trainer and the Mii Fighters are three characters in a single slot. Which means six characters in two slots, so we need to remove 4 from the amount of veterans.
65 - 4 = 61
So far, from the 19 days we've got an update, 14 had a veteran.
We'll need to remove them.
61 - 14 = 47
And we also need to know how much of the "everything else" was shown, which is as simple as...
103 total days - 61 veteran days = 42 days
Yeah, that.
How how many of those did we get so far? Thankfully, we know the answer through elemination process.
We got an update on 19 days, 14 had a veteran. So obviously, five of them did not.
But how many of those days can we get? Well, that's also simple.
42 - 5 = 37
37 days. That's quite a lot, honestly.