Rudy's OBTF

Total exercise days

… is the total count of exercise days

\begin{equation*}
  \sum_{d \in D} 1 = |D| = \boxed{MY-TOTAL-EXERCISE-DAYS} ~ \text{days} \thinspace,
\end{equation*}

\begin{equation*} \sum_{d \in D} 1 = |D| = \boxed{792} ~ \text{days} \thinspace, \end{equation*}

computed by

(defun my-total-exercise-days ()
  (hash-table-count (my-exercise-log)))