user123248: Why is it taking so long to mine a single block. Like last hour only 2 blocks have been mined. Currently been 45 min since the last block was mined.
According to blockchair
Hour Blocks
 5  *****    
 6  ******   
 7  ******   
 8  *****   
 9  ******** 
10  ***      
11  ****     
12  **       
13  **       

What could make 45 minutes go by without a single block being mined and having so many unconfirmed transactions still?

user13866: The time to produce the next block is completely unaffected by the number of unconfirmed transactions.
The time is generally expected to follow a Poisson distribution as explained in answers to a related question.

I'm no statistician so what follows may be nonsense:
A Poisson distribution with a lambda of 6 shown as a probability mass looks like this

So in a thousand hours I might expect to see

160 hours where 6 blocks were produced
45 hours where 2 blocks were produced

Either that or something odd has happened, like a couple of large mining pools going offline.
It would be interesting to gather some of these sort of stats from the blockchain record but I expect this has already been done somewhere.

123248: <p>Why is it taking so long to mine a single block. Like last hour only 2 blocks have been mined. Currently been 45 min since the last block was mined.</p>
<p>According to <a href="https://blockchair.com/bitcoin/blocks" rel="nofollow noreferrer">blockchair</a></p>
<pre><code>Hour Blocks
 5  *****    
 6  ******   
 7  ******   
 8  *****   
 9  ******** 
10  ***      
11  ****     
12  **       
13  **       
</code></pre>
<p>What could make 45 minutes go by without a single block being mined and having so many unconfirmed transactions still?</p>
 13866: <p>The time to produce the next block is completely unaffected by the number of unconfirmed transactions.</p>
<p>The time is generally expected to follow a Poisson distribution as explained in answers to <a href="https://bitcoin.stackexchange.com/q/22978/13866">a related question</a>.</p>
<hr />
<p>I'm no statistician so what follows may be nonsense:</p>
<p>A Poisson distribution with a lambda of 6 shown as a probability mass looks like this</p>
<p><a href="https://i.stack.imgur.com/Vd3Rv.png" rel="noreferrer"><img src="https://i.stack.imgur.com/Vd3Rv.png" alt="enter image description here" /></a></p>
<p>So in a thousand hours I might expect to see</p>
<ul>
<li>160 hours where 6 blocks were produced</li>
<li>45 hours where 2 blocks were produced</li>
</ul>
<p>Either that or something odd has happened, like a couple of large mining pools going offline.</p>
<p>It would be interesting to gather some of these sort of stats from the blockchain record but I expect this has already been done somewhere.</p>
