Hi Jeff @JTR19, I agree with what @Joe wrote and have observed his findings too. Although, I’m satisfied with about 6 hours warmup before entering he code. I always look at the dual readings where the two sensors overlap, and only once did II notice significant differences beyond two hours.
Also, I have a Galaxy Watch6 and use a third party app [g-Watch] so I can see the G7 readings - the CGM readings can be delayed up to 5 minutes - just like on Dexcom Follow. Me watch also has a “little extra” with the glucose value number, like right now, 90 minutes after an 80 gram carb supper including warm apple crisp, I see 143 mg/dl -3, along with reading time and a line graph; the time stamp is 3 minutes before my reading time and the “-3” tells me the prior reading was 146. I like this convenience when I awaken from sleep - only need to open one eye.