<p></p>
<p><b>@akshaim</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/15507#discussion_r552712427">sys/net/link_layer/Kconfig.lorawan</a>:</p>
<pre style='color:#555'>> +
+config LORAMAC_DEFAULT_LINKCHK
+    int "Link check interval (in seconds)" if LORAMAC_ADVANCED_OPTIONS
+    depends on USEMODULE_RN2XX3
+    default 0
+    help
+        Configure the default link check interval (in seconds). 0 means the link
+        check process is disabled. The link check process is used by an
+        end-device to validate its connectivity with the network. The frame has
+        no payload. When a `LinkCheckReq` is received by the network server via
+        one or multiple gateways, it responds with a `LinkCheckAns` MAC command.
+
+config LORAMAC_DEFAULT_RX1_DELAY
+    int "RX1 window delay (in milliseconds)" if LORAMAC_ADVANCED_OPTIONS
+    depends on USEMODULE_GNRC_LORAWAN || USEMODULE_RN2XX3
+    default 1000
</pre>
<p>Please correct me if I am wrong, isn't the time calculated based on the time for the uplink to reach the gateway + network latency. The time for uplink to reach the gateway is what I meant by time on air.  I used this tool < <a href="https://avbentem.github.io/airtime-calculator/ttn/eu868/52,12" rel="nofollow">https://avbentem.github.io/airtime-calculator/ttn/eu868/52,12</a> > to calculate the TOA, assuming an overhead size of 15 bytes in each packet.</p>

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