When miners are hashing blocks, how often do they update the list of transactions that are in the block?

Hey all,

I'm trying to un-tangle how I think about how miners include transactions into blocks.

My understanding is that the hash of all of the transactions is taken into account when mining it. That would mean that the calculation would change completely if more transactions were added when mining it. My main question is, how often do transactions get added to the current block that the miner is hashing, if at all?

A bonus question would be: if they get added into the block in the middle of hashing it, wouldn't that decrease the probability of finding a block? It would be like starting over from scratch, right?

submitted by /u/andrew_cziryak
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source https://www.reddit.com/r/btc/comments/kmv0vv/when_miners_are_hashing_blocks_how_often_do_they/