IIRC, @Luke Dashjr did something fancy to measure this somehow. Or maybe it was Chow with bitnodes (https://bitnodes.io/nodes/all/) Anyhow, I think the difference is like a low integer multiple of reachable nodes. So maybe 45-90k.

Oh, and if you want a maximally private node, you can’t use the internet. I feed my node via broadcast satellite…Blockstream broadcasts all new transactions, new blocks and all old blocks on a loop. All you need to do is setup a receiver and you can feed your node everything it needs (modulo trusting that Blockstream doesn’t spend hundreds of thousands of dollars to create fake but valid proof of work block headers!)