One point to make is easier for you, is to look at the 5Nd as 5Nd = 500%, not time.

We've jumped up the hash rate since yesterday, and another jump up again just now.
Those two jumps, of course, affect the rate that we consume the 5Nd.

So e.g. if you were half way though the 5Nd (i.e. 250% at 35PH) but now it's (for who knows how long?) jumped up to 55PH, then the next 250% will be a lot quicker.
I can't tell you how long it will be in time, since that depends on the changing pool hash rate.
You can certainly see the Diff% rising on the top left of every web page though.