It took me some 1 hour 20 minutes to accept 5,2 million transactions to the mempool. Took some 2 minutes 23 seconds to generate a “light” block template.
I mined the 1G block 0000000004822a2d638459cf5a41c4df9f255f6744c4fd51bc81d5854cce0cbd on my RPi locally (with its respectable 800khash/s, it took me some 50 minutes), without hitting swap. The submission process (local re-validation) took some 9 minutes 50 seconds. It was correctly validated by my other BCHN node configured to accept 1GB blocks.
5.2M transactions took some 5GB of RAM, with the rest of my 8GB being used to create and validate the block.
I cannot show you the block on a node explorer, as it is out of Scalenet's consensus. But it being an RPi, the results are easily reproducible.