Were one or more machines required to be running 24/7 on the network after the first block was mined?

Were one or more machines required to be running 24/7 on the network after the first block was mined?

After mining the genesis block, did Satochi have to leave his computer running to mine the subsequente empty blocks?

Was he running the whole network on a single node or did he require multiple nodes to test the transaction verifications?

What would happen if at some point all nodes were off and no transactions or blocks were being generated?

At some point the whole net work were probably a couple of personal computers. Did they run 24/7?

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