Actual possessions per game?

[WestGOAT]

I see that basketball-reference uses the following formula to estimate possession per game (https://www.basketball-reference.com/about/glossary.html#poss):

the formula for teams is 0.5 * ((Tm FGA + 0.4 * Tm FTA - 1.07 * (Tm ORB / (Tm ORB + Opp DRB)) * (Tm FGA - Tm FG) + Tm TOV) + (Opp FGA + 0.4 * Opp FTA - 1.07 * (Opp ORB / (Opp ORB + Tm DRB)) * (Opp FGA - Opp FG) + Opp TOV)).

How accurate is this measure? Are there resources available that have the actual counts of possessions per game?

[feyki]

((Fga+ fta*0,45)+(OppFga+OppFta*0,45))/2= Pure Pace.