diff --git a/man/systemd.network.xml b/man/systemd.network.xml
index b263220e0c..f7c4e3e49e 100644
--- a/man/systemd.network.xml
+++ b/man/systemd.network.xml
@@ -2682,7 +2682,7 @@ Token=prefixstable:2002:da8:1::</programlisting></para>
 
         <listitem><para>Lifetime in seconds for the DNS server addresses listed in
         <varname>DNS=</varname> and search domains listed in <varname>Domains=</varname>. Defaults to
-        604800 seconds (one week).</para></listitem>
+        3600 seconds (one hour).</para></listitem>
       </varlistentry>
 
     </variablelist>
@@ -2721,10 +2721,9 @@ Token=prefixstable:2002:da8:1::</programlisting></para>
         <term><varname>PreferredLifetimeSec=</varname></term>
         <term><varname>ValidLifetimeSec=</varname></term>
 
-        <listitem><para>Preferred and valid lifetimes for the prefix measured in
-        seconds. <varname>PreferredLifetimeSec=</varname> defaults to 604800
-        seconds (one week) and <varname>ValidLifetimeSec=</varname> defaults
-        to 2592000 seconds (30 days).</para></listitem>
+        <listitem><para>Preferred and valid lifetimes for the prefix measured in seconds.
+        <varname>PreferredLifetimeSec=</varname> defaults to 1800 seconds (30 minutes) and
+        <varname>ValidLifetimeSec=</varname> defaults to 3600 seconds (one hour).</para></listitem>
       </varlistentry>
 
       <varlistentry>
@@ -2775,9 +2774,8 @@ Token=prefixstable:2002:da8:1::</programlisting></para>
       <varlistentry>
         <term><varname>LifetimeSec=</varname></term>
 
-        <listitem><para>Lifetime for the route prefix measured in
-        seconds. <varname>LifetimeSec=</varname> defaults to 604800 seconds (one week).
-        </para></listitem>
+        <listitem><para>Lifetime for the route prefix measured in seconds.
+        <varname>LifetimeSec=</varname> defaults to 3600 seconds (one hour).</para></listitem>
       </varlistentry>
 
     </variablelist>
diff --git a/src/network/networkd-network.c b/src/network/networkd-network.c
index d41253c388..1c00b98660 100644
--- a/src/network/networkd-network.c
+++ b/src/network/networkd-network.c
@@ -423,7 +423,7 @@ int network_load_one(Manager *manager, OrderedHashmap **networks, const char *fi
                 .dhcp_server_emit_timezone = true,
 
                 .router_lifetime_usec = RADV_DEFAULT_ROUTER_LIFETIME_USEC,
-                .router_dns_lifetime_usec = 7 * USEC_PER_DAY,
+                .router_dns_lifetime_usec = RADV_DEFAULT_VALID_LIFETIME_USEC,
                 .router_emit_dns = true,
                 .router_emit_domains = true,
 
diff --git a/src/network/networkd-radv.c b/src/network/networkd-radv.c
index eda44e191e..7b98251570 100644
--- a/src/network/networkd-radv.c
+++ b/src/network/networkd-radv.c
@@ -105,8 +105,8 @@ static int prefix_new_static(Network *network, const char *filename, unsigned se
                 .network = network,
                 .section = TAKE_PTR(n),
 
-                .preferred_lifetime = 7 * USEC_PER_DAY,
-                .valid_lifetime = 30 * USEC_PER_DAY,
+                .preferred_lifetime = RADV_DEFAULT_PREFERRED_LIFETIME_USEC,
+                .valid_lifetime = RADV_DEFAULT_VALID_LIFETIME_USEC,
                 .onlink = true,
                 .address_auto_configuration = true,
         };
@@ -163,7 +163,7 @@ static int route_prefix_new_static(Network *network, const char *filename, unsig
                 .network = network,
                 .section = TAKE_PTR(n),
 
-                .lifetime = 7 * USEC_PER_DAY,
+                .lifetime = RADV_DEFAULT_VALID_LIFETIME_USEC,
         };
 
         r = hashmap_ensure_put(&network->route_prefixes_by_section, &network_config_hash_ops, prefix->section, prefix);
@@ -669,11 +669,11 @@ int radv_add_prefix(
         if (r < 0)
                 return r;
 
-        r = sd_radv_prefix_set_preferred_lifetime(p, lifetime_preferred_usec, lifetime_preferred_usec);
+        r = sd_radv_prefix_set_preferred_lifetime(p, RADV_DEFAULT_PREFERRED_LIFETIME_USEC, lifetime_preferred_usec);
         if (r < 0)
                 return r;
 
-        r = sd_radv_prefix_set_valid_lifetime(p, lifetime_valid_usec, lifetime_valid_usec);
+        r = sd_radv_prefix_set_valid_lifetime(p, RADV_DEFAULT_VALID_LIFETIME_USEC, lifetime_valid_usec);
         if (r < 0)
                 return r;