docs: include so links to wiki, update SLEEP_TIME default

SLEEP_TIME is now 6 hours instead of 3 because of the default TIMESPAN of 6 hours.

README.md

@@ -54,7 +54,7 @@ See [Environment variables](#environment-variables) for configuration options.
 | `POSTAL_CODE` | Postal code of where shows are available.                                                                       | 30309                            |
 | `USER_AGENT`  | Custom user agent string for HTTP requests.                                                                     | Uses random if not specified     |
 | `TZ`          | Timezone                                                                                                        | System default                   |
-| `SLEEP_TIME`  | Sleep time before next run in seconds (default: 10800, Only used with Docker.)                                  | 10800                            |
+| `SLEEP_TIME`  | Sleep time before next run in seconds (default: 21600, Only used with Docker.)                                  | 21600                            |
 | `OUTPUT_FILE` | Output file name (default: xmltv.xml)                                                                           | xmltv.xml                        |
 
 ### Command line arguments
@@ -69,3 +69,21 @@ See [Environment variables](#environment-variables) for configuration options.
 | `--userAgent`  | Custom user agent string for HTTP requests.                                                                     | Uses random if not specified     |
 | `--timezone`   | Timezone                                                                                                        | System default                   |
 | `--outputFile` | Output file name (default: xmltv.xml)                                                                           | xmltv.xml                        |
+
+## Setup and running in intervals
+
+### Running natively
+
+You can run zap2xml natively on your system. It is recommended to use a task scheduler to run it in intervals.
+
+Here are some links to get you started on your machine:
+
+- Linux and Raspberry Pi: https://github.com/jef/zap2xml/wiki/Running-on-Linux-and-Raspberry-Pi
+- macOS: https://github.com/jef/zap2xml/wiki/Running-on-macOS
+- Windows: https://github.com/jef/zap2xml/wiki/Running-on-Windows
+
+If you want to run zap2xml in intervals, you can use a task scheduler like `cron` on Linux or the Task Scheduler on Windows. Each of the wiki pages above has a section on how to set up zap2xml to run in intervals.
+
+### Running in Docker
+
+You can run zap2xml in a Docker container. The `SLEEP_TIME` environment variable can be used to set the interval between runs. The default is 21600 seconds (6 hours).

entrypoint.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-SLEEP_TIME=${SLEEP_TIME:-10800}
+SLEEP_TIME=${SLEEP_TIME:-21600}
 
 while true; do
     DATE=$(date)