diff --git a/README.md b/README.md
index 996ca95..6869e84 100644
--- a/README.md
+++ b/README.md
@@ -137,8 +137,9 @@ You can specify configuration options either via a config file (default: `config
 | YAML key / Env. variable                                                     | Default                                          | Description                                                                                                                                                              |
 |------------------------------------------------------------------------------|--------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 | `env` /<br>`ENVIRONMENT`                                                     | `dev`                                            | Whether to use development- or production settings                                                                                                                       |
-| `app.aggregation_time` /<br>`WAKAPI_AGGREGATION_TIME`                        | `02:15`                                          | Time of day at which to periodically run summary generation for all users                                                                                                |
-| `app.report_time_weekly` /<br>`WAKAPI_REPORT_TIME_WEEKLY`                    | `fri,18:00`                                      | Week day and time at which to send e-mail reports                                                                                                                        |
+| `app.aggregation_time` /<br>`WAKAPI_AGGREGATION_TIME`                        | `0 15 2 * * *`                                   | Time of day at which to periodically run summary generation for all users                                                                                                |
+| `app.report_time_weekly` /<br>`WAKAPI_REPORT_TIME_WEEKLY`                    | `0 0 18 * * 5`                                   | Week day and time at which to send e-mail reports                                                                                                                        |
+| `app.leaderboard_generation_time` /<br>`WAKAPI_LEADERBOARD_GENERATION_TIME`  | `0 0 6 * * *,0 0 18 * * *`                       | One or multiple times of day at which to re-calculate the leaderboard                                                                                                    |
 | `app.import_batch_size` /<br>`WAKAPI_IMPORT_BATCH_SIZE`                      | `50`                                             | Size of batches of heartbeats to insert to the database during importing from external services                                                                          |
 | `app.inactive_days` /<br>`WAKAPI_INACTIVE_DAYS`                              | `7`                                              | Number of days after which to consider a user inactive (only for metrics)                                                                                                |
 | `app.heartbeat_max_age /`<br>`WAKAPI_HEARTBEAT_MAX_AGE`                      | `4320h`                                          | Maximum acceptable age of a heartbeat (see [`ParseDuration`](https://pkg.go.dev/time#ParseDuration))                                                                     |
diff --git a/config.default.yml b/config.default.yml
index 7a7c9c4..b3b48fe 100644
--- a/config.default.yml
+++ b/config.default.yml
@@ -12,12 +12,12 @@ server:
   public_url: http://localhost:3000   # required for links (e.g. password reset) in e-mail
 
 app:
-  aggregation_time: '02:15'                   # time at which to run daily aggregation batch jobs
-  leaderboard_generation_time: '06:00;18:00'  # time at which to run daily aggregation batch jobs
-  report_time_weekly: 'fri,18:00'             # time at which to fan out weekly reports (format: '<weekday)>,<daytime>')
-  inactive_days: 7                            # time of previous days within a user must have logged in to be considered active
-  import_batch_size: 50                       # maximum number of heartbeats to insert into the database within one transaction
-  heartbeat_max_age: '4320h'                  # maximum acceptable age of a heartbeat (see https://pkg.go.dev/time#ParseDuration)
+  aggregation_time: '0 15 2 * * *'                          # time at which to run daily aggregation batch jobs
+  leaderboard_generation_time: '0 0 6 * * *,0 0 18 * * *'   # times at which to re-calculate the leaderboard
+  report_time_weekly: '0 0 18 * * 5'                        # time at which to fan out weekly reports (extended cron)
+  inactive_days: 7                                          # time of previous days within a user must have logged in to be considered active
+  import_batch_size: 50                                     # maximum number of heartbeats to insert into the database within one transaction
+  heartbeat_max_age: '4320h'                                # maximum acceptable age of a heartbeat (see https://pkg.go.dev/time#ParseDuration)
   custom_languages:
     vue: Vue
     jsx: JSX