Yes, this DOES help accuracy, for two reasons:
First, it pushes down the priority “weighting” of the older, stale readings.
Second, when the Sensor is nearly new, the “curve” changes very quickly. Your subcutaneous tissue does mount a bit of a response, even though the wire surface is titanium. (It’s a response to the puncture damage and pressure from the wire, not so much a “foreign invader” immunological response.) Conditions change rapdily during days one and two, waiting a full 12 hours between pokes on these days is (IMO) not optimal.
There’s another issue which might call for more pokes: If all of your recent calibration readings are at nearly the same bG, you should try and enter a couple which are closer to the edges of of your normal range. Entering a whole bunch of calibrations at 105, 111, 102, 106 creates a “solid” data point for bG readings near those levels, but it can’t set an accurate slope for the curve.
If you find yourself with level, stable readings right around 80 mg/dL, you really, really want to enter a calibration before grabbing at a sugar tab, regardless of how recently your entered a calibration value at 100+. This really helps a lot to set the right “curve” for Dexcom to create reliable readings at low bG levels.
Similarly, if you find yourself with a level, stable reading a bit high (NOT post-meal, those aren’t stable!), then you should enter it before correcting. If you’ve entered at least two two calibrations under good conditions, separated by at least 30 mg/dL, AND one of them is at the low side of your normal range, I think that’s enough for for every day after days one and day two. Day one and day two need more (especially day one).
The bottom line is, the QUALITY of the calibration readings is much more important than the number of entries. It only takes two readings to set a really good calibration, but they need to be at least 30 mg/dL from each other, and they need to be done during ultra-flat periods. (The “level arrow” isn’t sufficient, you’ve probably noticed that the “level arrow” can remain present even during a slow rise in bG.)
HOWEVER: A lot of redundant readings aren’t helpful. So, if you entered a high-quality “106” calibration only six hours ago, and you’ve just done a new meter readings and get “102”, don’t put it in-- it will merely lower the priority of other recent readings with better dispersion through your bG range, while adding no new information at all.