fixup: envvar drkey epoch ref between router/control, default

doc/manuals/control.rst

@@ -64,6 +64,7 @@ Options
    Run :option:`control help completion [shell] <control help>` for usage information on the
    autocomplete script for a particular shell.
 
+.. _control-envvars:
 
 Environment variables
 ---------------------
@@ -76,7 +77,10 @@ Environment variables
    This can only work correctly if the same value is set for all connected control services in the
    test network.
 
-   The format is a :ref:`duration <control-conf-duration>` with unit suffix (e.g. ``10s``).
+   Also applies to the :ref:`router <router-envvars>`.
+
+   :Type: :ref:`duration <control-conf-duration>`
+   :Default: ``24h``
 
 Configuration
 =============

doc/manuals/router.rst

@@ -51,6 +51,8 @@ Options
    Run :option:`router help completion [shell] <router help>` for usage information on the
    autocomplete script for a particular shell.
 
+.. _router-envvars:
+
 Environment Variables
 ---------------------
 
@@ -95,9 +97,11 @@ Environment Variables
    This option relates :option:`features.experimental_scmp_authentication <router-conf-toml features.experimental_scmp_authentication>`.
 
    Override the global duration for :doc:`/cryptography/drkey` epochs.
-   This environment variable also applies to :program:`control`, see :envvar:`SCION_TESTING_DRKEY_EPOCH_DURATION`.
 
-   :Type: :ref:`duration <control-conf-duration>`
+   Also applies to the :ref:`control service <control-envvars>`.
+
+   :Type: :ref:`duration <common-conf-duration>`
+   :Default: ``24h``
 
 .. envvar:: SCION_TESTING_ACCEPTANCE_WINDOW
 
@@ -108,7 +112,7 @@ Environment Variables
    are accepted. See :ref:`SPAO specification <spao-absTime>`.
 
    :Type: :ref:`duration <control-conf-duration>`
-   :Default: 5m
+   :Default: ``5m``
 
 
 Configuration