user6113: I was wondering the number of slots the Byron era (testnet) had or the slot number when Byron finished.
The only info I've been able to find is systemStart": "2019-07-24T20:20:16Z" coming from testnet-shelley-genesis.json.
( Calculate timestamp from slot discusses about the same thing but with mainnet Byron. )
Any help would be great. Thanks in advance!

user4023: As far as I know, Shelley started at epoch 1, i.e. after a single Byron epoch 0 on Cardano Testnet.
Byron started on Testnet:
epoch 0 ... slot 1031 ... block 1 ... date 2019/07/25 ... time 02:03:56

Shelley started on Testnet:
epoch 1 ... slot 21600 ... block 20570 ... date 2019/07/29 ... time 20:20:16


P.S.
There's also one simple way to check this out. Start downloading a Cardano Testnet DB onto your computer, and, at the very beginning of the process, apply cardano-cli command:
cardano-cli query tip --testnet

But the best solution is to send a request to the IOHK helpdesk.

6113: <p>I was wondering the number of slots the <strong>Byron</strong> era (<strong>testnet</strong>) had or the slot number when Byron finished.</p>
<p>The only info I've been able to find is <strong>systemStart&quot;: &quot;2019-07-24T20:20:16Z&quot;</strong> coming from <strong>testnet-shelley-genesis.json</strong>.</p>
<p>( <a href="https://cardano.stackexchange.com/questions/491/calculate-timestamp-from-slot">Calculate timestamp from slot</a> discusses about the same thing but with mainnet Byron. )</p>
<p>Any help would be great. Thanks in advance!</p>
 4023: <p>As far as I know, Shelley started at epoch 1, i.e. after a single Byron epoch 0 on Cardano Testnet.</p>
<p><a href="https://explorer.cardano-testnet.iohkdev.io/en/browse-blocks?page=0&amp;perPage=20" rel="nofollow noreferrer">Byron started on Testnet</a>:</p>
<pre><code>epoch 0 ... slot 1031 ... block 1 ... date 2019/07/25 ... time 02:03:56
</code></pre>
<p><a href="https://explorer.cardano-testnet.iohkdev.io/en/browse-blocks.html?page=1029&amp;perPage=20" rel="nofollow noreferrer">Shelley started on Testnet</a>:</p>
<pre><code>epoch 1 ... slot 21600 ... block 20570 ... date 2019/07/29 ... time 20:20:16
</code></pre>
<p><br></p>
<p><strong>P.S.</strong></p>
<p>There's also one simple way to check this out. Start downloading a Cardano Testnet DB onto your computer, and, at the very beginning of the process, apply <code>cardano-cli</code> command:</p>
<pre><code>cardano-cli query tip --testnet
</code></pre>
<p>But the best solution is to send a request to the IOHK helpdesk.</p>
