Can you show me where it says that the data is for 8-days and not the 14-days that they periodically release it for? Also, time of draw does not matter because the period between each subsequent data release is 14-days.Absolutely incorrect!!!
Height of poor mathematics
The number you used is not for 14 days but only 8 days. Moreover, the exact time is not known so a better calculation is taking the difference between successive data points, adjust by draw and divide by 14.
451+ speed at this point is 240 per day.
Whether draw starts on that period or not is irrelevant - I don't think you understand data analytics enough to judge my quality of mathematics.