If a miner takes too long, more than a single block interval, the second address is free to compete with the first address in the next block interval. Each block interval is a turn. If they both fail to produce a block in the second turn, the third address on the list is free to compete in the third turn. The pattern continues until a block is found. When a block is found, the next turn goes to the address after the one who produced the last block. For example, if the second address finds a block in the third turn, the next turn goes to the third address.

Because of the recent development, I think more people are thinking about a possible 51% attack. People might think that if it is possible to do a 51% attack on the XMR blockchain network, it would be possible on the Bitcoin blockchain network as well. But as we know, this is not going to be so easy. Whoever plans for it knows better than some people like me who don't have much knowledge about it.

It will be too expensive to operate a 51% attack on the Bitcoin blockchain. But is it doable? What if some companies together want to spend a huge money to test it? I assume the entire crypto market will collapse if something like this happens.