diff --git a/dal/db_query/queries.sql b/dal/db_query/queries.sql
index 5677042..b064e14 100644
--- a/dal/db_query/queries.sql
+++ b/dal/db_query/queries.sql
@@ -400,22 +400,21 @@ WITH TimeBucket AS (
          SELECT
              tb.time_interval,
              COUNT(DISTINCT session) AS open_count
-         FROM
-             (
-                 SELECT
-                     session,
-                     MIN(created_at) AS first_start_time
-                 FROM
-                     answer
-                 WHERE
-                     answer.quiz_id = $3
-                   AND start = TRUE
-                   AND created_at >= $1::timestamp
-                   AND created_at <= $2::timestamp
-                 GROUP BY
-                     session
-             ) AS first_starts
-                 JOIN TimeBucket tb ON date_trunc('hour', first_starts.first_start_time) = tb.time_interval
+         FROM (
+                  SELECT
+                      session,
+                      MAX(created_at) AS first_start_time
+                  FROM
+                      answer
+                  WHERE
+                      answer.quiz_id = $3
+                    AND start = TRUE
+                    AND created_at >= $1::timestamp
+                    AND created_at <= $2::timestamp
+                  GROUP BY
+                      session
+              ) AS first_starts
+                  JOIN TimeBucket tb ON date_trunc('hour', first_starts.first_start_time) = tb.time_interval
          GROUP BY
              tb.time_interval
      ),
@@ -425,20 +424,20 @@ WITH TimeBucket AS (
              COUNT(DISTINCT session) AS result_count
          FROM
              (
-                 SELECT
-                     session,
-                     MIN(created_at) AS first_result_time
-                 FROM
-                     answer
-                 WHERE
-                     answer.quiz_id = $3
-                   AND result = TRUE
-                   AND created_at >= $1::timestamp
-                   AND created_at <= $2::timestamp
-                 GROUP BY
-                     session
-             ) AS first_results
-                 JOIN TimeBucket tb ON date_trunc('hour', first_results.first_result_time) = tb.time_interval
+              SELECT
+                  session,
+                  MAX(created_at) AS first_result_time
+              FROM
+                  answer
+              WHERE
+                  answer.quiz_id = $3
+                AND result = TRUE
+                AND created_at >= $1::timestamp
+                AND created_at <= $2::timestamp
+              GROUP BY
+                  session
+          ) AS first_results
+              JOIN TimeBucket tb ON date_trunc('hour', first_results.first_result_time) = tb.time_interval
          GROUP BY
              tb.time_interval
      ),