For some reason I never liked the number $180$, so
and together with the 90-days and 120-days and 150-days numbers
\begin{array}{| r | r |} \hline \hline \text {Metric} & \text{90 B-days} & \text{120 B-days} & \text{150 B-days} & \text{181 B-days}\\ \hline \text {Q per day} & 5.4 & 4.5 & 7.4 & 5.1\\ \text{% answered} & \text {80%} & \text {79%} & \text {80%} & \text {82%}\\ \text{avid users | %} & 54 | \text {5.5%} & 58 | \text {4.8%} & 63 | \text {4.3%} & 86 | \text {5.1%}\\ \text {total users} & 981 & 1210 & 1455 & 1689\\ \text {Engaged users %(*)} & 34\text{%} & 37\text{%} & 37\text{%} & 38\text{%}\\ \text {answer ratio} & 1.8 & 1.7 & 1.7 & 1.6\\ \text {Visits/day (median)} & 192 & 225 & 308 & 496\\ \hline \end{array}
(*)"Engaged Users" are those that do not have reputation $1$ or $101$, i.e. those that had at count day performed some reputation-affecting activity on the site (I count out also the $101$'s because the $100$ points are SE-registration bonus if they are active on other sites). I decided to show "engaged" rather than "unengaged" users, since all other metrics in the table have the association "larger value = better".
(P.S. The 30-days numbers can be found here, and the 60-days numbers here
COMMENTARY
Median Visits/day were just short of $5$ to be characterized as "Okay", and very much increased compared to one month before.
Participation increased (both the % Avid Users and the % Engaged Users), given also that the rate of new registrations per day continues to be unbelievably constant during all these 6-month period (7-9 new accounts per day, month per month, what kind of spooky stationary stochastic process is this?)
Economics.SE starts to acquire a life of its own, I think.
I will continue to monitor monthly, but maybe I should leave the site to show us its seasonality (by reporting again in 3-months from now, in mid-August).